Answers

2015-11-29T07:38:08+05:30
Mean (grouped data )
the ratio of sum of observations to no.of observations is called mean.
mean=sum of observations/no.of observations.
mean of 1st'n'natural numbers =n+1/2
therefore,s(n)=n(n+1)/2
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2015-11-29T08:01:54+05:30
Mean or arithmetic mean = Sum of all observation / number of observation It is just like average. For eg of mean :- 6,15,20,12,18,16,13 mean -> Sum of all observation / number of observation Mean -> 6+15+20+12+18+16+13/7 = 100/7 = 14.28 so, mean is 14.28.
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