the mean of the following distribution is 25.2 find the missing frequency c. i. 0-10,10-20,20-30,30-40,40-50 frequency-8,p,10,11,9
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Solution -
C.I 0-10 10-20 20-30 30-40 40-50
Frequency 8 X 10 11 9.
Midvalue 5 15 25 35 45
Mean = 25.2
8+x+10+11+9
8×5+15x+10×25+11×35+9×45
=25.2
1080+15x=957.6+25.2x
x=
10.2
122.4
x=12.
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