Question

The mean of 25 observation is 36. Out of these observation if the mean of the first 13 observation is 32 and that of last 13 observation is 40.,then what is the 13th observation.

Answer it fast plzz!
Make sure that Answer is 36 but I want whole solution

Answer 1

Hi friend
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Your answer
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Mean of 25 observations = 36

Sum of total observations = (25 × 36) = 900

Mean of first 13 observations = 32

Sum of first 13 observations = (13 × 32) = 416

Mean of last 13 observations = 40

Sum of last 13 observations = (13 × 40) = 520

So,
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13th observation = Sum of first and last 13 observations - sum of total observations

=> (416 + 520) - 900

=> 936 - 900 = 900

Hence, 13th observation = 36

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