Question

The table below classifies the members of a committee according to their ages.

Age		Number of Members
25 − 30 30 − 35 35 − 40 40 − 45 45 − 50 50 − 55 55 − 60		6 14 16 22 5 4 3

Calculate the mean age of the members of this committee.

Answer 1

We can make the complete table as follows:

Age		Number of Member		Class Average		Total Age
25 − 30		6		27.5		165
30 − 35		14		32.5		455
35 − 40		16		37.5		600
40 − 45		22		42.5		935
45 − 50		5		47.5		237.5
50 − 55		4		52.5		210
55 − 60		3		57.5		172.5
Total		70				2775

Mean age of the members of the committee =