Find the mean....
F =frequency
CI =class interval...
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By using shortcut method.....
Method no.2
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The midpoint of each class interval
is taken as observations.
x1= 47.5
x2= 52.5
x3= 57.5
x4= 62.5
x5= 67.5
x6= 72.5
x7= 77.5
no of observation = 5+8+30+25+14+12+6
= 100
mean= sum of observation ÷ no of obobsevatio
mean = 437.5 ÷ 100
mean = 4.375
is taken as observations.
x1= 47.5
x2= 52.5
x3= 57.5
x4= 62.5
x5= 67.5
x6= 72.5
x7= 77.5
no of observation = 5+8+30+25+14+12+6
= 100
mean= sum of observation ÷ no of obobsevatio
mean = 437.5 ÷ 100
mean = 4.375
Use shortcut method....
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