The mean of 15numbers is 5. If 2is added to each number,then find the new mean?
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Answer: 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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Mean of 15 numbers is 5
Total of 15 numbers is 15×5=75
If 2 is added to each number total of change is 2×5=10
After adding 2 to each number the new toal of 5 numbers is 75+10=85
Now the new mean is 85/5 = 17
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