Find out the mean of the following distribution
Items - 0-5 , 5-10 ,10 -15 , 15-20 , 20-25 ,25-30 , 30 -35 , 35-40
Frequency 2 , 5 ,7 ,13 ,21, 16, 8, 3
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CGI xiii Y zoo chip VP do St at zoo chip FM
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