Question

mean of 50 observation was found to be 80.4 but later on , it was discovered that 96 was mislead as 69 at one place find correct mean

Answer 1

80.94 is the correct mean

Answer 2

mean = sum of observations / no. of observations
80.4 = sum/ 50
sum = 80.4 × 50
sum= 4020

subtract 69
from the sum
4020-69=3951
then add 96
3951 +96= 4047
so new mean = 4047/ 50= 80.94

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