Find the mean and variance for the following frequency distrubutio | Filo
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Class 11

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Find the mean and variance for the following frequency distrubution

Classes0-1010-2020-3030-4040-50
Frequencies5815166

Solution:
 Class interval     
 0-10 5 5 -2 4 -10 20
 10-20 8 15 -1 1 -8 8
 20-30 1525  0 0 0 0
 30-40 1635  1 1 16 16
 40-50 6 45 4 12 24
 Total  50    10 68
We have  
Width of class
Assumed mean  

Mean, 

Variance 


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