Question

Choose the most appropriate option:

The mean of 72 items was found to be 63. If two of the items were mis­recorded as 27 and 9 instead of 72 and 90 respectively, find the correct mean.

Options

• 64.25

• 64.75

• 63.25

• 65.75

Answer 1

64.75

Explanation:

Error in sum`=72+90-27-9=126`

The error means `=126/72=1.75`