Question

The mean of six numbers: (x-5), x, 5, 15,1,2 is 9.Find the mean of first three numbers.
please do this with explanation

Answer 1

Answer:

here

Step-by-step explanation:

(x-5)+x+5+15+1+2/6=9

(x-5)+x+23=9

now we sort it by sending numbers on left side of = and variables on right side of

rememebr when we send numbers on other side we change the sign

x+x=5-23+9

2x=14-23

2x=(-9)

x=-9/2

x=(-4.5)

first 3 no.

(-4.5-5), -4.5, 5

mean=

-9.5+-4.5+5/3

=12.33