Question

The mean of 15 numbers is 40 if the mean of first 8 number if 38 and the mean of last 8 number is 45 find the 8 number

Answer 1

given that the mean of first 15 numbers is 40

so the sum first 15 number will be = 40*15 =600
sum of first 8 terms is = 8*38 =304

sum of last 8 terms will be =8*45 =360


The eight term will be = (304+360) -600
= 664-600 =64

so the answer is 64




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