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Question

The mean of 5 numbers is 27. If a new number is included, the new mean becomes 25. Find the included number.​

A
12
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B
13
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C
15
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D
11
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Solution

The correct option is C 15

Mean of 5 observations =27

Sum of 5 observations =27×5=135

On including an observation, the new sum of 6 observations =25×6=150

Included observation = Sum of 6 observations – Sum of 5 observations =150135=15


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