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Question

The mean monthly salary of 10 members  of a group is Rs. 1445, one more member whose monthly salary is Rs. 1500 has joined the group. Find mean monthly salary of 11 members of the group.


A
Rs.1550
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B
Rs.1950
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C
Rs.1050
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D
Rs.1450
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Solution

The correct option is D Rs.$$1450$$
Mean monthly salary of $$10$$ members $$=Rs.\ 1445 $$
New member salary $$=Rs.\ 1500$$
 New mean$$=\dfrac{1445\times 10+1500}{10+1}$$ 
$$=\dfrac{15950}{11}$$
$$ =Rs.\ 1450$$.

Mathematics

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