7. Arithmetic mean of 100 items of a series is 40. Later on, it was discovered that two values
of 53 and 24 were wrongly taken in place of 35 and 22. Find out the correct mean.
Ans. 39.&
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Explanation:
Number of observations=100
Mean=40
Sum of values of observations=40×100
=4000
30 and 27 noted instead of 3 and 72
Correct sum=4000−30−27+3+72
=3982
Correct mean=
100
3982
=39.82
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