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Question
The mean of 20 observations is 24, if 3 is added to each number find the new mean.
The mean of 20 observations is 24, if 3 is added to each number find the new mean.
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Solution
Mean of 20 numbers=24
Therefore,sum of 20 numbers=20×24=480
If 3 is added to each number,then total added to 20 numbers=3×20=60
Therefore,new sum=480+60=540
Therefore,new mean=540/20=27
Therefore,sum of 20 numbers=20×24=480
If 3 is added to each number,then total added to 20 numbers=3×20=60
Therefore,new sum=480+60=540
Therefore,new mean=540/20=27
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