Question

Mean of 25 observations was found to be 78.4. but later on it was found that 96 was misread 69. the correct mean is:

Answer 1

no of observations = 25

mean = 78.4

sum of observations = 78.4* 25
= 1960

96 number is misread 69

1960-69 +96 = 1933

new mean = 1933 / 25 = 77.32

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Answer 2

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