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Question

The mean of 55 numbers is 18. If one number is excluded, the mean of remaining numbers becomes 16. Find the excluded number.

A
26
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B
126
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C
130
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D
125
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Solution

The correct option is D 126
Mean of 55 numbers =18
Sum of 55 numbers =18×55=990
After excluding one number,
Mean of 54 numbers =16
Sum of 54 numbers =16×54 = 864
thus, the number excluded =990864=126

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