Question

The ages (in months) of a group of 50 students are given below. Find the mean age :
Age
156-158
158-160
160-162
162-164
164-166
166-168

Number of Students
2
4
8
16
14
6

Answer 1

Assumed mean method :

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Mean = a + ( Sigma fidi )/( sigma fi )

a = Assumed mean which is usually

taken from one of the class mark

d = xi - a

fi = frequency
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Mean = 163 + ( 8/50 )

= 163 + 0.16

= 163.16

Therefore ,

mean = 163.16

••••

Answer 2

Answer:

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