Question

the mean of 18 number is 57 if 8 is added to each number find the new mean

Answer 1

Answer:

Step-by-step explanation:

Let the sum of all the nos. be = x

Mean = Sum of all observation/Total no. of observations

= x/18 = 57

= x = 57*18 = 1026

No. to be added to get the new mean = 9*18=162

= x+162/18

=1026+162/18

= 1188/18

=66 Ans

Answer 2

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Answer: 65

Step-by-step explanation:

Mean=sum of all numbers÷total number

Then :sum of all numbers =Mean×total number

Sum = 18 * 57 = 1026

If 8 is added to each number then the sum increases by 144 because when 8 is added to all 18 numbers then the sum is 144.

New sum=1026 + 144 = 1170

New Mean= 1170/18 = 65

Hope it helps u.