Answers

2014-10-08T20:30:42+05:30
1) sum=420
 no of observations = 15
 mean = \frac{total sum of observations}{no of observations}
mean=420/15=28

2) sum of observations=144
 no of observations=7
 so AM=144/7=20.6
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2014-10-08T20:51:38+05:30
Mean=sum of observations/number of observations. Therefore ,420/15=28 Mean of 17,31,12,27,15,19,23/7=144/7=20.571 PLEASE MARK AS THE BEST!!!☆★
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