Calculate arithmetic mean of the following frequency distribution :
Class : less than 10, 10-20,20-30,30-40,40-50,50-60, more than 60
Frequency: 5,12,18,22,6,4,3
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Explanation:
class frequency X fx
(f)
0-10 5 5 25
10-20 12 15 180
20-30 18 25 450
30-40 22 35 770
40-50 6 45 270
50-60 4 55 220
60-70 3 65 195
70 2110
Mean = fx/x
= 2110/70 = 30.14
mean is 30.14
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