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Question

A scientist is weighing each of 30 fishes. Their mean weight worked out is 30 gm and a standard deviaiton of 2 gm. Later, it was found that the measuring scale was misaligned and always under-reported every fish weight by 2gm. The correct mean and standard deviation (in gm) of fishes are respectively:


A

32, 2

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B

32, 4

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C

28, 2

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D

28, 4

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Solution

The correct option is A

32, 2


Correct mean = observed mean + 2=30+2=32
Correct S.D.= observed S.D.=2


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