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**CSS General Science & Ability Paper 2016**

**Q.No.10 (b)** There are nine students in a group having ages 15, 15, 16, 16, 16, 17, 17, 18, 19. Calculate mean, median, mode and range of their ages also define the above mentioned terms.

**Mean**

The mean is defined as, the sum of the values divided by the number of values.

The mean of the above data set is given as,

**Median**

The middle value of an arranged data set is called median.

Arranged data means writing the values in ascending order. The given values in ascending order are given as:

15, 15, 16, 16, 16, 17, 17, 18, 19 (already in ascending order)

Hence, the median of the above data set is given as,

The median is 16.

**Mode**

The mode is the most repeated value in a data set.

The most repeated value in the given data is 16. Hence, the mode is 16.

**Range**

Range is the difference between the largest value and the smallest value.

In the given data set the largest value is 19, and the smallest value is 15. Hence,

Range = 19 − 15 = 4