Question

The mean of $15$ observations is $32$. Find the resulting mean. if each observation is decreased by $7$ is $25$

• A. True
• B. False
• C. Can't determine
• D. None of these

Answer 1

The correct option is A True

Mean of $15$ observations = $32$
Sum of $15$ observations = $15\times 32$ = $480$
Since, each observation is decreased by 7, new sum = $480-7\times 15$ = $375$
Thus, new mean = $\frac{sum}{numberofobservation}$ = $\frac{375}{15}$ = $25$