D. The mean of 15 numbers is 5. If 2 is added to each number, then what will be the new mean?
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The mean of 15 numbers is 5
Therefore, their sum=15 x 5=75
If 2 is added to each number then 2 is added to all the 15 numbers
therefore 2 x 15 ie, 30 more will be added to the sum of 75
=75+30=105
Therefore, new mean = 105/15=7 [mean=sum of observations/no. of observations]
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