15 no. have mean 9. The sum of these 15 no. is
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the mean of 15 numbers is 5
therefore their sum=15*5=75
if 2 is added to each number then 2 is added to the all the 15 numbers
therefore 2*15 or 30 more will be added to the sum or 75
=75+30=105
therefore new mean = 105/15=7 [mean=sum of observations/no. of observations]
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