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Mean

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Question

Help,
The mean of 25 observatios is 36. Out of thes,if the mean of first 13 observation is 32 and that of last 13 observation is 40,find the 13th observation.

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Solution

Sum of 26 observation = 13 * 32 + 13 * 40 = 416 +520 = 936
Sum of 25 observation = (25 * 36) =900
Thirteenth observation = (sum of 26 observation) – (sum of 25 observation)
= (936) – (900) = 36
Hence, 13^th observation is 36.

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Q. Question 20
The mean of 25 observation is 36. Out of these observations, if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the

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