Question

if the mean of x x+2 x+4 x+6 and x+8 is 11 find average of last three number

Answer 1

Answer:

13

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Step-by-step explanation:

Sum = x + (x+2) + (x+4) + (x+6) + (x+8) = 5x + 20

numbers = 5

Mean = (5x + 20)/5 = x + 4

x + 4 = 11

x = 7

last three numbers are

7+4 , 7+6 , 7+8

11 , 13 & 15

sum = 11+13 + 15 = 39

Average = 39/3 = 13