JEE Main 2019 — Statistics Question with Solution
From: JEE Main 2019 (Online) 10th April Morning Slot
Question
If for some x R, the frequency distribution of the marks obtained by 20 students in a test is :
then the mean of the marks is
| Marks | 2 | 3 | 5 | 7 |
|---|---|---|---|---|
| Frequency | (x + 1)2 | 2x - 5 | x2 - 3x | x |
then the mean of the marks is
Choose an option
Show full solutionCorrect option: B
Correct answer
B2.8
Step-by-step explanation
Number of students
Average marks =
| Marks | 2 | 3 | 5 | 7 |
|---|---|---|---|---|
| No. of students | 16 | 1 | 0 | 3 |
Average marks =
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Statistics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2019, covering the Statistics chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.