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1) sum=420
 no of observations = 15
 mean = \frac{total sum of observations}{no of observations}

2) sum of observations=144
 no of observations=7
 so AM=144/7=20.6
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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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