Mathematics

Using the information given in the adjoining histogram; calculate the mean.

Measures of Central Tendency

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Answer

The table for the adjoining histogram is :

Class interval	Class mean (x)	Frequency (f)	fx
15 - 25	20	10	200
25 - 35	30	20	600
35 - 45	40	25	1000
45 - 55	50	15	750
55 - 65	60	5	300
Total		Σf = 75	Σfx = 2850

By formula,

Mean = $\dfrac{Σfx}{Σf} = \dfrac{2850}{75}$ = 38.

Hence, mean = 38.

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