Mean of 50 observations was found to be 80.5 . but later on it was discovered that 96 was misread as 69 at one place. Find correct mean. If in each observation a constant value K is added, how is the mean affected.
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Answer:
Mean=80.5
No of observations=50
Sum of observations=80.5×50=4025
Later:
Sum of observations=4025+96-69=4052
Mean=4052/50=81.04
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