Find the mean and variance for the following frequency distributio | Filo
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Find the mean and variance for the following frequency distribution 

Classes0-3030-6060-9090-120120-150150-180180-210
Frequencies23510352

Solution:
 Class      
0-30  2 15 -3 9 -6 18
 30-60 3 45 -2 4 -6 12
 60-90 5 75 -1 1 -5 5
 90-120 10 105 0 0 0 0
 120-150 3 135 1 1 3 3
 150-180 5 165 2 4 10 20
 180-210 2 195 3 9 6 18
 Total 30    2 76
Here,
Mean, 

Variance
=

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