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Repeated Readings, Mean and Standard Deviation for JEE: 4 solved questions

Real JEE paper questions on repeated readings, mean and standard deviation, part of units and measurements. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2016 to 2026. No sign-in needed to read them.

What this topic asks

• Mean and standard deviation of readings — 4 questions

All 4 questions with solutions

• Four persons measure the length of a rod as 20.00 cm, 19.75 cm, 17.01 cm and 18.25 cm. The relative error in… JEE Main 23rd Jan 1st Shift 2026
• A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale recor… JEE Main 6th Sept 2nd Shift 2020
• A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s,… JEE Main 2016
• A student in the laboratory measures thickness of a wire using screw gauge. The readings are 1.22 mm, 1.23 mm… JEE Main 28th June 2nd Shift 2022