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Saturday, 31 October

JEE Main · Maths · Statistics

Mean of Discrete Data

JEE Main asked Mean of Discrete Data 6 times in 6 of the 108 shifts Lumi analysed, in 2020, 2021, 2023 and 2026. It belongs to Variance and SD, in Statistics (Maths). The longest wait between two years asking it was 3 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
6
in 6 shifts
Years
4 of 8
First asked
2020
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2023 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Maths questions.

00.10.20’170.08’200.10’210’220.07’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 3 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20220 of 24
  • 20213 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

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

Difficulty

Easy 1Medium 5Hard 0

4 of the 6 questions had a numerical answer.

Every question

All 6 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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 | kk | 28 | 54 | k+1k+1 | 5 | is 2121,…MediumSingle correct
  2. 11 Apr 2023, Shift 1 · Q13Let x1,x2,…,x100x_1, x_2, \ldots, x_{100} be in an arithmetic progression, with x1=2x_1 = 2 and their mean equal to 200. If…MediumSingle correct
  3. 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
  4. 22 Jul 2021, Shift 2 · Q89Consider the following frequency distribution : Class : 0 - 6 | 6 - 12 | 12 - 18 | 18 - 24 | 24 - 30 Frequency : a | b | 12 | 9 | 5 If…MediumNumerical value
  5. 31 Aug 2021, Shift 1 · Q90The mean of 10 numbers 7×8, 10×10, 13×12, 16×14, ...7\times8,\ 10\times10,\ 13\times12,\ 16\times14,\ ... is __________.MediumNumerical value
  6. 6 Sep 2020, Shift 2 · Q75Consider the data on xx taking the values 0,2,4,8,…,2n0, 2, 4, 8, \ldots, 2^n with frequencies nC0,nC1,nC2,…,nCn{}^nC_0, {}^nC_1, {}^nC_2, \ldots, {}^nC_n…MediumNumerical value

Shifts: 6 Sep 2020, Shift 2, 18 Mar 2021, Shift 1, 22 Jul 2021, Shift 2, 31 Aug 2021, Shift 1, 11 Apr 2023, Shift 1, 2 Apr 2026, Shift 1.

Same topic

Other ideas in Variance and SD

Variance and SD has 20 ideas JEE Main has asked; 10 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas