Calculate arithmetic mean of the following frequency distribution: class 0_10, 10-20,20-30,30-40,40-50,50-
60,60-70, frequency 5, 12,18,22,6,4,3 =.30.14
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class interval frequency (f) mean value (x) fx
0 - 10 7 5 35
10 - 20 14 15 210
20 - 30 28 25 700
30 - 40 26 35 910
40 - 50 19 45 720
50 - 60 9 55 495
Sum 100 3070
A.M.=
∑f
i
∑f
i
x
i
=
100
3070
=
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