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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 :

A

`(5.5375 pm0.0739)mm`

B

`(5.5375 pm0.0740)mm`

C

`(5.538 pm0.074)mm`

D

`(5.54 pm0.07)mm`

Text Solution

Verified by Experts

The correct Answer is:
D
`d_(av), = 5.5375` mm
`Deltad` = 0.07395 mm
`:.` Measured data are up to two digits after decimal `:. d=(5.54 pm0.07)` mm.
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