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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