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Q.

The average of 24 observations is 25. If three new observations 24.5, 27 and 23.5 be added. Find the new average.

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a

23

b

24

c

25

d

26

answer is C.

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Detailed Solution

Sum of 24 observations = 24 × 25 = 600

Three new added = 24.5, 27, 23.5 

Total = 75

Now sum of 27 observations = 675

Averages = 67527 = 25

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