A student measuring the diameter of... | Units & Measurements | JEE Main 2020

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JEE MAIN 2020

06-09-2020 S2

Question

A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50 mm, 5.55 mm, 5.45 mm; 5.65 mm. The average of these four readings is 5.5375 mm and the standard deviation of the data is 0.07395 mm. The average diameter of the pencil should therefore be recorded as

Select the correct option:

A

$(5.5375 \pm 0.0739) \mathrm{mm}$

B

$(5.54 \pm 0.07) \mathrm{mm}$

C

$(5.538 \pm 0.074) \mathrm{mm}$

D

$(5.5375 \pm 0.0740) \mathrm{mm}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

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