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 $5.50 \mathrm{~mm}, 5.55 \mathrm{~mm}, 5.45 \mathrm{~mm} ; 5.65 \mathrm{~mm}$. The average of these four readings is $5.5375 \mathrm{~mm}$ and the standard deviation of the data is $0.07395 \mathrm{~mm}$. The average diameter of the pencil should therefore be recorded as :
Correct Option: , 3
Solution:
Use significant figures. Answer must be upto three significant figures.
Ans. (3)
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