12. 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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Answer:
Mean= sum of no.s / no. of items
Mean=20, no. of items=18
Sum of numbers =20×18
=360
20 is added to first ten numbers.
=>20 is added 10 times.
= 20×10=200 is added to 360
360+200=560
New sum of numbers =560
Their mean = 560/20
= 28
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