Physics · 2020
JEE Main · 6 September 2020, Shift 2 · Q1
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,…
A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings $\displaystyle 5.50$ mm, $\displaystyle 5.55$ mm, $\displaystyle 5.45$ mm ; $\displaystyle 5.65$ mm . The average of these four readings is $\displaystyle 5.5375$ mm and the standard deviation of the data is $\displaystyle 0.07395$ mm. The average diameter of the pencil should therefore be recorded as :
Official answer
(3)
$\displaystyle (5.54 \pm 0.07) \mathrm{mm}$
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