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Arithmetic Mean

The Mean of 5...

Question

The Mean of 5 observations is 25. If one of the observations , 27 is removed from it, what will be the new mean?

A

25.5

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B

24.5

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C

23.75

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D

24.25

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Solution

The correct option is B
24.5

Mean of 5 observations = 25.

Total of the 5 observations = 25 $\times$ 5 = 125

Removing 27 we get - 125 - 27 = 98

$∴$ The new mean = $\frac{98}{4}$ = 24.5

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