Q158
The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct means is-
A.
76.54
B.
78.4
C.
79.48
AnswerD.
81.32
Answer: Option C
Solution
Answer: Option C
Solution:
Correct sum = (78.4 × 25 + 96 - 69) = 1987∴ Correct mean
=
= 79.48