A student measuring the diameter of a pe...

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

`(5.5375 pm 0.0739)mm`

`(5.5275 pm 0.0740) mm`

`(5.538 pm 0.074) mm`

`(5.54 pm 0.07)mm`

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