find the mean of the following frequency distribution *
class: 10-25 , 25-40 , 40-55 , 55-70 ,70-85 , 85-100 frequency: 5 , 21 , 21 , 8 , 25 , 20
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- Mean of frequency =( 5+21+21+8+25+20) ÷6
- 100÷6
- 16.67 Answer
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