Question

The mean of $15$ observations is $32$. Find the resulting mean, if each observation is increased by $3$.

• A. $35$
• B. $33$
• C. $25$
• D. $20$

Answer 1

The correct option is A $35$

Mean of $15$ observations $=32$
Sum of $15$ observations $=32\times 15=480$
Every observation is increased by $3$
New sum $=480+3\times 15=525$
Mean $=\frac{525}{15}=35$