The mean of 100 items was found to be 64. Later on, it was discovered that two items were misread as 26 and 9 instead of 36 and 90 respectively. The correct mean is

Solution:

Mean = sum of observations/number of observations

Given mean of 100 items = 64

Sum of observations = 6400

Sum of misread items = 26+9 = 35

Sum of actual items = 36+90 = 126

So correct sum = 6400 – 35 + 126

= 6491

Correct mean = 6491/100

= 64.91

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