Question

The below table shows the number of different books that are sold in a shop. The mean and the median of the given data set are respectively.

• A. 18, 22
• B. 20, 20.5
• C. 18.5, 22

Answer 1

The correct option is B 20, 20.5

The given data set is 23, 27, 18, 12

This data set contains 4 data.

Mean = $\frac{sumofalldata}{numberofdata}$

= $\frac{23+27+18+12}{4}$

= $\frac{80}{4}$

= 20

For a set with an even number of values, the median is the mean of the two middle values.

Arranging the numbers in ascending order, we get

12, 18, 23, 27

Median = $\frac{18+23}{2}$

= $\frac{41}{2}$

= 20.5

Hence, the mean and median of the data set are 20 and 20.5.