The mean of 20 numbers is 18. If 2 is added to each number, what is the new mean?
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Mean of 20 no.=18
Sum of 20 no.=20×18 i.e.360
When 2 is added to each no.,we get
360+(20×2)
=400
Now,new mean value of 20 no.=400÷20
=20
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