JEE Main Maths · Statistics

Mean of Discrete Data

Mean of Discrete Data (Statistics) was asked 4 times in 4 JEE Main shifts, 2020–2026, out of the 42 shifts Lumi analysed. 2 of the 4 had a numerical answer.

Times asked: 4; in 4 shifts
Years: 2020–2026
Usual format: Numerical value; Calculation
Pattern: Frequent; repeats across shifts

How it is asked

Unknown frequency from mean of grouped data
Mean after replacing one observation

Difficulty

Easy 1Medium 3Hard 0

Where it sits

Chapter: Statistics. Topic: Variance and SD, 27 questions over 10 ideas.

All 4 questions

Newest first, each with its options and official answer.

2 Apr 2026, Shift 1 · Q8If the mean of the data | Class | 5-10 | 10-15 | 15-20 | 20-25 | 25-30 | 30-35 | | Frequency | 2 | $k$ | 28 | 54 | $k+1$ | 5 | is $21$ ,…MediumSingle correct
11 Apr 2023, Shift 1 · Q13Let $x_1, x_2, \ldots, x_{100}$ be in an arithmetic progression, with $x_1 = 2$ and their mean equal to 200. If…MediumSingle correct
18 Mar 2021, Shift 1 · Q87The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place.…EasyNumerical value
6 Sep 2020, Shift 2 · Q75Consider the data on $x$ taking the values $0, 2, 4, 8, \ldots, 2^n$ with frequencies ${}^nC_0, {}^nC_1, {}^nC_2, \ldots, {}^nC_n$ …MediumNumerical value