the mean of the following distribution is
class interval :0-10,10-20,20-30,30-40,40-50,
frquency:12,16,6,7,9
a)12
b)16
c)18
d)11
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Answer:
Class Interval frequency (fi) Mid value fixi
0-10 12 5 60
10-20 16 15 240
20-30 6 25 150
30-40 7 35 245
40-50 9 45 405
N=∑fi=50 ∑fixi=1100
∴Mean=∑fi∑fixi=501100=22
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