JEE Main · Maths · Probability
Biased vs Unbiased Instrument Selection
JEE Main asked Biased vs Unbiased Instrument Selection once in the 108 shifts Lumi analysed, on 7 Apr 2025, Shift 2. It belongs to Bayes' Theorem, in Probability (Maths).
Updated 2026-10-24
- Times asked
- 1
- in 1 shift
- Years
- 1 of 8
- First asked
- 2025
- the only year
- Pattern
- New since 2024
- asked once so far
Questions on this idea a shift, by year
2017–2026. Asked in 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Maths questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Single correct is the usual form. Skill tested: calculation.
- Probability coin was fair given head
Difficulty
The question was multiple choice.
Every question
The question
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
Shift: 7 Apr 2025, Shift 2.
Same topic
Other ideas in Bayes' Theorem
Bayes' Theorem has 6 ideas JEE Main has asked; 3 of them came up in more than one question.
- Bayes' Theorem Application9× · 2026
- Theorem of Total Probability3× · 2026
- Implicit Equally Likely Priors2× · 2024
- Missing or Lost Card Scenariosonce · 2025
- Urn and Ball Transfer Problemsonce · 2022