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. $32,4$
• B. $28,2$
• C. $28,4$
• D. $32,2$

Answer 1

The correct option is D $32,2$

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