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#Engineering

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:
Option: 1 $(5.5375\pm 0.0739)mm$

Option: 2 $(5.5375\pm 0.0740)mm$
Option: 3 $(5.538\pm 0.074)mm$
Option: 4 $(5.54\pm 0.07)mm$

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