Question

The mean of six numbers :X-5,x-1,x,x+ 2,x+4 and x + 12, is 15. Find x. Also find the mean of the first four
numbers.​

Answer 1

Answer:x=13, the mean of first four numbers is 12

Step-by-step explanation:

Answer 2

Answer:13, 16.25

Step-by-step explanation:

(X-5+x-1+x+x+ 2+x+4+x+12)/6=15

(6x+12) /6=15

6x+12=15*6

6x+12=90

6x=90-12

6x=78

X=78/6

X=13

Mean of first four numbers

(X-5+x-1+x+x+ 2+x+4)

=(13-5+13-1+13+13+2+13+4)/4

=65/4

=16.25