The following table gives the number of boys of a particular age in a – InterviewSolution

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1.

The following table gives the number of boys of a particular age in a class of 40 students. Calculate the mean age of the students.Age (in year):151617181920No. of students:38101054

Answer»

Age (x)	No. of students (y)	yx
15	3	45
16	8	128
17	10	170
18	10	180
19	5	95
20	4	80
	N = 40	\(\sum\)yx = 698

Mean = \(\frac{\sum yx}{N}\)

\(=\frac{698}{40}=17.45\)

Therefore,

mean age is 17.45 years.

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