Question

The mean of a data set consisting of 20 observations is 40. If one observation 53 was wrongly recorded as 33, then the correct mean will be ______.

Options

• 41

• 49

• 40.5

• 42.5

Answer 1

The mean of a data set consisting of 20 observations is 40. If one observation 53 was wrongly recorded as 33, then the correct mean will be 41.

Explanation:

Correct mean `(20 xx 40 - 33 + 53)/20` = 41