Question

The AM of 20 observations was obtained as 150. Later it was found that

two observations 15 and 18 were wrongly recorded as 50 and 80 respectively .

Find the corrected AM.
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Answer 1

Mean of 20 observations = M = (Sum Total of the 20 observations)/ 50 ( Total number of observations) = 150

Therefore, the total sum = 20*150= 3000.

Subtracting 50 & 80(which was wrongly recorded)

3000 - 50 - 80 = 3870

Adding 15 & 18  ( which is to be included)

3870 +18 + 15 =  3903

Therefore, now the total sum of the 20 observations is 3903

Hence, the required mean is 3903/20

= 195.15

Thus ,the mean is 195.15

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Answer 2

Answer:

The corrected mean is 245.15.

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