Question

if the mean of x, x + 2, X + 4, x + 6 and X + 8 is 11 what is the average of the last three numbers​

Answer 1

Answer:13

Step-by-step explanation:x+x+2+x+4+x+6+x+8/5=11 , 5x+20=55,5x=35,X=35/5=7. X+4=11,x+6=13,x+8=15. Average of last three numbers,

11+13+15/3=39/3=13

Answer 2

Answer:

mean =sum/no

mean is given as 11

11=x+x+2+x+4+x+6+x+8/5

11=5x+20/5

11×5=5x+20

55-20=5x

35=5x

7=x

now last 3 terms are

x+4 ....so 7+4=11

x+6.....so 7+6=13

x+8.....so 7+8=15

hence their mean is

11+13+15/3

39/3=13

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