the mean of 20 observation was found to be 65 but later on it was found that 69 was misread as 96. find the correct mean?
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Your answer
Mean of 20 observations = 65
Sum of 20 observations = (20 × 65) = 1300
Wrong observation = 96
Correct observation = 69
Correct sum of 20 numbers =
Incorrect sum - incorrect observation + correct observation
= 1300 - 96 + 69
= 1273
correct mean = 1273/20= 63.65
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