91.
A student calculates the mean of 5 numbers as 27. Later he realizes that he misread one number as 27 instead of 72. The correct mean is:
Answer: B
Incorrect sum = Mean × Count = 27 × 5 = 135.
The difference due to misreading = Correct value - Incorrect value = 72 - 27 = 45.
The correct sum is 45 more than the calculated sum.
Correct sum = 135 + 45 = 180.
Correct mean = \(\frac{180}{5} = 36\).
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