Question

The mean of tree numbers is 8.The mean of those three numbers and x is 7 . Find x​

Answer 1

Answer:

x = 4

Step-by-step explanation:

The mean of three numbers = 8.

=> Sum of the three numbers = 8*3 = 24 ............(A)

[Mean = Sum/No. of observations]

The mean of three numbers and "x" is 7

=>Sum of these three numbers & "x" = 7*4 = 28 ..........(B)

Let the sum of the three numbers be denoted as "S"

=> S = 24 and S + x = 28  .........(Using (A) and (B))

=> 24 + x = 28

=> x = 4

Answer 2

Answer:

x=4

Step-by-step explanation:

Let the three no.s be a, b , c

now,

a+b+b/3=8

or, a+b+c= 24

Again,

a+b+c+x/4=7

or, 24+x=28

or, x = 4