# Topic Questions: • understand the concept of a continuous random variable, and recall and use properties of a probability density function — 9709 P6 Continuous random variables > 49 9709 P6 Continuous random variables topic questions (124 marks) on understand the concept of a continuous random… — 35 papers, 2020–2026. Open the exact… - Canonical HTML: https://www.examsci.com/topics/cie-ial/mathematics/9709-p6/continuous-random-variables/understand-the-concept-of-a-continuous-random-variable-and-recall-and-use-properties/ - Markdown mirror: https://www.examsci.com/topics/cie-ial/mathematics/9709-p6/continuous-random-variables/understand-the-concept-of-a-continuous-random-variable-and-recall-and-use-properties/index.md --- CIE IAL · Mathematics · 9709 P6 · Continuous random variables 49 9709 P6 Continuous random variables topic questions are tagged to this syllabus point across 35 papers (2020–2026). Only the parts whose knowledge graph matches this syllabus statement are counted, and the table shows which parts of each question are involved. - 49 topic questions - 35 papers - 124 tagged marks - 33.6% of topic questions - 29.4% of topic marks - 2020–2026 - Syllabus 2020–2027 - [All 9709 P6 Continuous random variables topic questions](https://www.examsci.com/topics/cie-ial/mathematics/9709-p6/continuous-random-variables/) - [All paper codes](https://www.examsci.com/topics/) Core finding **This Continuous random variables syllabus point appears in 35 9709 P6 papers across 2020–2026, contributing 49 topic questions and 124 marks.** The most recent appearance is 9709/61 May/June 2026. That equals 33.6% of the 146 topic questions and 29.4% of the 422 marks tagged to Continuous random variables. Only parts tagged to this subtopic are counted, so a four-part question can contribute one item and one part's marks. The table lists every matching question, its tagged parts and marks, with a link back to the paper page. Sessions are newest first, so the statement can be traced back through the full paper history. ## Topic questions by session Newest sessions first. Parts and marks count only the parts tagged to this subtopic; “x of y parts” shows how much of the question is tagged elsewhere. Select the paper cell to open the matching question on the paper page, or use **Go to Practice Hub** to answer that exact question in the Interactive Practice Hub. | Paper | Question | Type | Parts | Marks | Difficulty | Practice | | --- | --- | --- | --- | --- | --- | --- | | [**9709/61** May/June 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2026-may-june-9709-61/#q-6) | **Q6** Truncated Exponential PDF Mean - CIE A-Level Mathematics 2026 Jun Paper 61 Q6 | FRQ | 1 of 2 parts ((a)) | 4 of 8 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1e7d105f-a163-46dc-9773-462f7c1fe733&question_id=9c51f475-bc9f-42ef-949b-3887516d2c49&source_detail=9709%2F61+May%2FJune+2026) | | [**9709/62** May/June 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2026-may-june-9709-62/#q-7) | **Q7** Expectation and Median of Continuous Random Variable - CIE A Level Mathematics | FRQ | 1 of 2 parts ((a)) | 6 of 10 on the paper | Hard | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bc359ba6-7bf8-4e8c-9790-e459dfddad73&question_id=1ceda16a-05c0-4435-b7f8-ed63100d46fe&source_detail=9709%2F62+May%2FJune+2026) | | [**9709/63** May/June 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2026-may-june-9709-63/#q-3) | **Q3** Variance of Continuous Random Variable - CIE 9709 Jun 2026 Paper 63 Q3 | FRQ | 1 part | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=74ef4622-3e1e-4518-8f9b-aad534d7f8bb&question_id=ce6b948c-8105-4755-8485-824b69964047&source_detail=9709%2F63+May%2FJune+2026) | | [**9709/65** May/June 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2026-may-june-9709-65/#q-4) | **Q4** Linear PDF Median and Expectation - CIE A-Level Mathematics 2026 Q4 | FRQ | 1 of 2 parts ((a)) | 5 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2dd7616-bb35-4a90-9d38-94eabdebe7b0&question_id=5319ce5a-d742-46b2-8976-e7d3d7eb18c3&source_detail=9709%2F65+May%2FJune+2026) | | [**9709/62** March 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2026-march-9709-62/#q-6) | **Q6** Continuous Probability Density Function of Stone Widths - CIE A Level Maths | FRQ | 1 of 4 parts ((a)) | 3 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1e26f7e9-2339-44ea-97d9-90bd9faf8598&question_id=93bb91c6-ea50-46cb-adde-9af401e5978e&source_detail=9709%2F62+March+2026) | | [**9709/63** October/November 2025 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2025-october-november-9709-63/#q-7) | **Q7** Continuous Random Variables and Symmetry - CIE A-Level Mathematics | FRQ | 3 parts ((a), (b), (c)) | 7 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=18122931-fdb9-4617-9faa-70fe47bc9057&question_id=162a60f5-24cd-487c-9e74-8493c24a07ff&source_detail=9709%2F63+October%2FNovember+2025) | | [**9709/62** May/June 2025 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2025-may-june-9709-62/#q-7) | **Q7** Properties of Continuous Probability Density Function - CIE A-Level Statistics Q7 | FRQ | 1 of 3 parts ((a)) | 3 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=982f1712-c9ba-4c4e-9a29-35443c2d9b8a&question_id=f99ebdf4-bf0d-4a12-9ccb-924fa4a6bf37&source_detail=9709%2F62+May%2FJune+2025) | | [**9709/63** May/June 2025 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2025-may-june-9709-63/#q-6) | **Q6** Properties of Continuous PDF - CIE A-Level Mathematics Q6 | FRQ | 1 of 2 parts ((a)) | 3 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=8986ca9e-f4c8-452f-9d4f-779f9ae8341c&question_id=c7d55e3a-653a-464d-bac3-990f2d28f0d0&source_detail=9709%2F63+May%2FJune+2025) | | [**9709/65** May/June 2025 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2025-may-june-9709-65/#q-8) | **Q8** Triangular PDF and Expected Value - CIE 9709 June 2025 Paper 65 Q8 | FRQ | 1 of 2 parts ((a)) | 2 of 6 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=627bd8eb-aabe-437a-ad23-57bfdea3384a&question_id=a7354924-8573-4519-a2e4-7b561d340318&source_detail=9709%2F65+May%2FJune+2025) | | [**9709/62** March 2025 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2025-march-9709-62/#q-4) | **Q4** Trapezoidal and Cosine PDFs - CIE A Level Mathematics 2025 Mar Paper 62 Q4 | FRQ | 1 of 3 parts ((a)(i)) | 2 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f515287f-f3f3-4960-8f26-88deb9234c4f&question_id=05a16343-45b6-49c3-81ca-b95bfd81b204&source_detail=9709%2F62+March+2025) | | [**9709/62** October/November 2024 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2024-october-november-9709-62/#q-6) | **Q6** Reciprocal Square PDF Challenge Time - CIE Probability & Statistics 2024 Nov Paper 62 Q6 | FRQ | 1 of 4 parts ((a)) | 1 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=fc7fa85c-90ff-4c56-a30e-642dba8c9f91&question_id=2de3abaa-3aee-46c1-b1c9-1bd1a7b44607&source_detail=9709%2F62+October%2FNovember+2024) | | [**9709/63** October/November 2024 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2024-october-november-9709-63/#q-4) | **Q4** Probability Density Function of Continuous RV - CIE A-Level Maths Q4 | FRQ | 1 of 2 parts ((a)) | 3 of 6 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b3b968f2-d15c-4fc1-a77f-eb69648eea83&question_id=e9868415-dffc-463c-986c-24f275980ad8&source_detail=9709%2F63+October%2FNovember+2024) | | [**9709/62** May/June 2024 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2024-may-june-9709-62/#q-7) | **Q7** Trigonometric Continuous Random Variable - CIE P6 Q7 | FRQ | 1 of 3 parts ((a)) | 3 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=559f71e6-d55f-40d6-9635-11c05b20209e&question_id=cc68d8d8-7a2c-4357-a32d-7cea97bd1901&source_detail=9709%2F62+May%2FJune+2024) | | [**9709/63** May/June 2024 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2024-may-june-9709-63/#q-5) | **Q5** Continuous Probability Density Function Properties - CIE A Level Mathematics Q5 | FRQ | 1 of 3 parts ((a)) | 3 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=41924067-a985-41dd-9b5b-a1e3dc5b7333&question_id=0e39f74b-3f88-4a07-9f4d-dfc5e1bf460c&source_detail=9709%2F63+May%2FJune+2024) | | [**9709/62** March 2024 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2024-march-9709-62/#q-6) | **Q6** Probability Density Functions and Variance - CIE Mathematics Q6 | FRQ | 1 of 3 parts ((a)) | 2 of 10 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2951c4cd-f503-4763-8cba-2310b86b2379&question_id=53841c69-fdc8-41e9-ae90-0bcd70c7c3d8&source_detail=9709%2F62+March+2024) | | [**9709/61** October/November 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-october-november-9709-61/#q-6) | **Q6** Symmetric Continuous Random Variable - CIE A-Level Maths 2023 | FRQ | 3 parts ((a), (b), (c)) | 8 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d0b0a284-b938-40b5-8127-f096a430986d&question_id=769a7a0a-47e3-4c65-84df-7a35a37c218d&source_detail=9709%2F61+October%2FNovember+2023) | | [**9709/62** October/November 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-october-november-9709-62/#q-5) | **Q5** Reciprocal PDF Properties - CIE A-Level Mathematics | FRQ | 1 of 3 parts ((b)) | 3 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=be37d972-339c-4296-b154-d6163cc7bc95&question_id=b98ff838-98c1-4214-b243-086d81b69e3c&source_detail=9709%2F62+October%2FNovember+2023) | | [**9709/63** October/November 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-october-november-9709-63/#q-6) | **Q6** Symmetric Continuous Random Variable PDF - CIE A-Level Maths | FRQ | 2 of 3 parts ((a), (b)) | 3 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e083de3a-a73a-40ab-8c97-5eb2697a2544&question_id=22ff3d91-ac0c-4951-945b-d4ba88c69351&source_detail=9709%2F63+October%2FNovember+2023) | | [**9709/61** May/June 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-may-june-9709-61/#q-2) | **Q2** Probability Density Function of Time - CIE Mathematics 2023 Jun Paper 61 Q2 | FRQ | 3 of 4 parts ((a), (b), (c)(i)) | 5 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4dd6ea6e-9eda-4989-bcf9-cc41cfe1d075&question_id=b5b8c7c0-d18f-443e-9b1c-c90dda7844dc&source_detail=9709%2F61+May%2FJune+2023) | | [**9709/62** May/June 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-may-june-9709-62/#q-7) | **Q7** Probability Density Functions - CIE 9709 Jun 2023 Paper 62 Q7 | FRQ | 2 of 3 parts ((a)(i), (b)) | 5 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bf59edf7-7e34-448e-93f7-4eae7e3c7614&question_id=bbeaa2de-646a-4f46-b4cd-5b4559d2305a&source_detail=9709%2F62+May%2FJune+2023) | | [**9709/63** May/June 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-may-june-9709-63/#q-7) | **Q7** Semicircular Probability Density Function - CIE 9709 S23 Paper 63 Q7 | FRQ | 1 of 2 parts ((a)) | 2 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=7c997abc-3f3f-417d-b55f-135f68c8fc81&question_id=4adc3351-7495-45eb-8da9-dc21b81c3a2e&source_detail=9709%2F63+May%2FJune+2023) | | [**9709/62** March 2023 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2023-march-9709-62/#q-3) | **Q3** Symmetrical Probability Density Function - CIE 9709 March 2023 Paper 62 Q3 | FRQ | 1 of 3 parts ((b)(i)) | 3 of 8 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=36ddbadd-413d-42bc-a7ad-f69ecc191173&question_id=74c4a30b-abaf-4428-81b4-649a240503c6&source_detail=9709%2F62+March+2023) | | [**9709/61** October/November 2022 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2022-october-november-9709-61/#q-6) | **Q6** PDF Transformation and Integration - CIE A-Level Maths 2022 Nov Paper 61 Q6 | FRQ | 2 of 4 parts ((a), (b)) | 3 of 7 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=9178b634-ff9a-4f53-beeb-a7291c712eb8&question_id=2ef43a8a-cd88-4fc0-9911-801ccc5dd7ae&source_detail=9709%2F61+October%2FNovember+2022) | | [**9709/62** October/November 2022 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2022-october-november-9709-62/#q-7) | **Q7** Symmetrical PDF and Parameter Determination - CIE 9709 Nov 2022 Paper 62 Q7 | FRQ | 2 of 3 parts ((b)(i), (b)(ii)) | 6 of 8 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=795bf32c-c031-4c1e-869d-62f99f38e2fe&question_id=005a8fa7-e8a8-403f-91e6-9868b14b4677&source_detail=9709%2F62+October%2FNovember+2022) | | [**9709/63** October/November 2022 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2022-october-november-9709-63/#q-6) | **Q6** PDF Transformations and Probability Calculation - CIE A-Level Mathematics Q6 | FRQ | 2 of 4 parts ((a), (b)) | 3 of 7 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=06b0dd29-c7c5-4cb1-81ed-76f633794f5e&question_id=8c590910-b24a-41e9-b23f-e25be908765d&source_detail=9709%2F63+October%2FNovember+2022) | | [**9709/61** May/June 2022 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2022-may-june-9709-61/#q-6) | **Q6** Uniform Continuous Distribution - CIE Statistics Q6 | FRQ | 1 of 4 parts ((a)) | 1 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d0ed09b6-1fa5-4462-8517-425c8c9ca93a&question_id=5af942ee-ab77-43a9-a40c-441e3a2deaef&source_detail=9709%2F61+May%2FJune+2022) | | [**9709/63** May/June 2022 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2022-may-june-9709-63/#q-7) | **Q7** Continuous Probability Density Functions - CIE A-Level Mathematics Q7 | FRQ | 1 of 4 parts ((a)(iii)) | 1 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bfa9969a-81b8-43b1-9447-bf005a19606f&question_id=e582083c-170c-4fda-8f3e-60f29db26ea0&source_detail=9709%2F63+May%2FJune+2022) | | [**9709/62** October/November 2021 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2021-october-november-9709-62/#q-7) | **Q7** Probability Density Function of Continuous Variable - CIE A Level Mathematics 2021 Nov Paper 62 Q7 | FRQ | 1 of 3 parts ((a)(i)) | 3 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=56c5403c-39cb-477e-a558-1c860c2f47e6&question_id=0297434d-6ba6-4bb3-867f-770e0aa52dcf&source_detail=9709%2F62+October%2FNovember+2021) | | [**9709/63** October/November 2021 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2021-october-november-9709-63/#q-4) | **Q4** Continuous Random Variable PDF and Median - CIE A-Level Probability & Statistics 2 Q4 | FRQ | 1 of 3 parts ((c)) | 3 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ebfb10d3-1022-42d9-93d1-3b7c800fa5ee&question_id=05ea1060-a566-4067-ae70-2a218f566723&source_detail=9709%2F63+October%2FNovember+2021) | | [**9709/61** May/June 2021 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2021-may-june-9709-61/#q-3) | **Q3** Symmetrical Probability Density Function - CIE A-Level Mathematics | FRQ | 1 part | 2 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=06ef86fd-7b9a-4969-a9f3-8d5cc9f747b3&question_id=a8133383-b554-43f5-829b-1c6b0c10ceb9&source_detail=9709%2F61+May%2FJune+2021) | | [**9709/61** May/June 2021 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2021-may-june-9709-61/#q-6) | **Q6** Continuous Random Variable Variance Proof - CIE A-Level Mathematics | FRQ | 1 part | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=06ef86fd-7b9a-4969-a9f3-8d5cc9f747b3&question_id=d5036f7c-37af-4dba-abf1-a201ad692a1d&source_detail=9709%2F61+May%2FJune+2021) | | [**9709/62** May/June 2021 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2021-may-june-9709-62/#q-3) | **Q3** Triangular Probability Density Function - CIE A-Level Maths 2021 Jun Q3 | FRQ | 1 of 2 parts ((a)) | 2 of 7 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ec6f00c8-7089-4018-92a7-a4ea178e7e0c&question_id=00adabe8-c7a5-4999-a195-7dff629218f2&source_detail=9709%2F62+May%2FJune+2021) | | [**9709/61** October/November 2020 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2020-october-november-9709-61/#q-4) | **Q4** Uniform Continuous Distribution PDF - CIE 9709 Nov 2020 Paper 61 Q4 | FRQ | 1 of 2 parts ((a)) | 1 of 5 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=93f29798-f845-4cf9-b116-efd0f6ef4f7c&question_id=3ddc8f85-8e29-4c47-a871-4bf4d2ab285a&source_detail=9709%2F61+October%2FNovember+2020) | | [**9709/61** May/June 2020 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2020-may-june-9709-61/#q-6) | **Q6** Bus Waiting Time PDF Analysis - CIE A-Level Mathematics P6 Q6 | FRQ | 2 of 6 parts ((a), (f)) | 2 of 11 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bf52d281-83f2-4bdd-9fd4-1492d428bc18&question_id=a9f624ac-d30b-47b9-9e10-ecee03822483&source_detail=9709%2F61+May%2FJune+2020) | | [**9709/62** May/June 2020 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2020-may-june-9709-62/#q-6) | **Q6** Continuous Random Variable PDF - CIE A-Level Mathematics Q6 | FRQ | 2 of 3 parts ((a), (c)) | 7 of 10 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5d6b87fb-8432-4b24-9dc0-166382efbfb7&question_id=7c5d36f9-fe00-4730-8006-7ae5b74c171d&source_detail=9709%2F62+May%2FJune+2020) | | [**9709/62** March 2020 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p6/2020-march-9709-62/#q-5) | **Q5** Lanta Juice Continuous PDF - CIE S2 Q5 | FRQ | 1 of 3 parts ((c)) | 2 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4e648b27-3a9b-4c69-99c8-99a565c73b45&question_id=c4f6dd6d-0c7d-4288-80aa-de58940ab960&source_detail=9709%2F62+March+2020) | ## Related topic questions in Continuous random variables - [• use a probability density function to solve problems involving probabilities, and to calculate the mean and variance of a distribution](https://www.examsci.com/topics/cie-ial/mathematics/9709-p6/continuous-random-variables/use-a-probability-density-function-to-solve-problems-involving-probabilities-and-to/) — 83 question items · 40 papers — 268 marks · 2020–2026 ## Topic question rules and edge cases **How many topic questions cover this syllabus point?** 36 question stems cover this subtopic across 35 papers, but only 49 tagged parts and 124 marks belong to it. Other parts of the same questions are assessed under different statements and are excluded from this page. **Which papers include this subtopic?** The table lists every matching session from 2020–2026. Each row links to the question anchor on the paper page, where the full paper context and practice entry point are available. **Why can one question appear under several subtopics?** The parts of one question can assess different syllabus statements. Each part is counted under its own subtopics, so the same question stem can appear on several subtopic pages while each page lists only the parts and marks tagged to that statement. **Can I practise these questions with AI marking?** Yes. Open a paper from the table and use the Interactive Practice Hub entry point. 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