97. The mean of 20 numbers is 20. If 2 is added
to each of the first 10 numbers, find the
mean of the new set of 20 numbers.
Answers
Answered by
0
Answer:
the answer is 30 but I am not sure
Answered by
4
Answer:
Step-by-step explanation:
Mean of first ten numbers= 20
No. of numbers(n) = 20
Summation of the numbers= Mean * n
= 20*20. = 400
10 is added to each of the first ten numbers.
Therefore, new summation = 400+ 2*10= 400+20
= 420
Mean of the new set of numbers = Summation / n
= 420/20
= 42/2. =21.
Ans = 21 is the mean if the new set of numbers.
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