JEE Main Maths · Statistics
Correcting Incorrect Variance
Correcting Incorrect Variance (Statistics) was asked 3 times in 3 JEE Main shifts, 2023–2025, out of the 42 shifts Lumi analysed. 1 of the 3 had a numerical answer.
- Times asked
- 3
- in 3 shifts
- Years
- 2023–2025
- Usual format
- Single correct
- Calculation
- Pattern
- Occasional
- repeats across shifts
How it is asked
- Corrected mean and sd after mistaken observation
- Correct variance after misread data
Difficulty
Easy 2Medium 1Hard 0
Where it sits
Chapter: Statistics. Topic: Variance and SD, 27 questions over 10 ideas.
Other repeat ideas in this topic
Every time it came
All 3 questions
Newest first, each with its options and official answer.
- 7 Apr 2025, Shift 1 · Q9The mean and standard deviation of 100 observations are 40 and 5.1, respectively. By mistake one observation is taken as 50 instead of 40.…EasySingle correct
- 8 Apr 2023, Shift 2 · Q18Let the mean and variance of 12 observations be and respectively. Later on, it was observed that two observations were…MediumSingle correct
- 13 Apr 2023, Shift 2 · Q29The mean and standard deviation of the marks of 10 students were found to be 50 and 12 respectively. Later, it was observed that two marks…EasyNumerical value