Question 5 [16 marks]

The following table gives the frequency distribution of ages for 120 employees of a university

Age Number of Employees

20 - 30 10

30 - 40 33

40 - 50 64

50 - 60 13

A. Find the:

i) Range

ii) Mean

iii) Modal Class - Interval

iv) Variance

v) Standard Deviation

B. On a pair of axis draw the Histogram and the Frequency Polygon.