The mean of 20 numbers is 18.If 3 is added to each of the first ten numbers, find the mean of the new set of 20 numbers.
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sum of no is=20×18=360
sum of no 3×10=360+30=390
new mean is390/20
=19.5
sum of no 3×10=360+30=390
new mean is390/20
=19.5
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