increased by $3$

30

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32

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34

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35

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Solution

The correct option is D $35$
Mean of $15$ observations $=$ $32$
Sum of $15$ observations $=$ $15 \times 32$ = $480$
Since, each observation is increased by $3$ , new sum $=$ $480 + 3 \times 15$ = $525$ .
Thus, new mean $=$ $\frac{s u m}{n u m b e r o f o b s e r v a t i o n}$ $=$ $\frac{525}{15}$ $=$ $35$

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