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Question

A scientist is weighing each 30 fishes. Their mean weight worked out is 30gm and standard deviation of 2gm. Later, it is found that 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
32,4
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B
28,2
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C
28,4
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D
32,2
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Solution

The correct option is D 32,2
Correct mean = observed mean + 2
30+2=32
Correct S.D = observed S.D = 2

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