Question

2. Write and solve an equation to find the value of x.
3.8, 4.2, 5.3, x; mean 4.8

Answer 1

5.9

Explanation:

The mean means arithmetic average (some people just say average here).

The average of 4 numbers is the sum of those 4 numbers divided by the number of numbers which is 4 in this case.

So we have this formula:

`(3.8+4.2+5.3+x)/(4)=4.8`

Multiply both sides by 4:

`3.8+4.2+5.3+x=4(4.8)`

Simplify:

`13.3+x=19.2`

Subtract 13.3 on both sides:

`x=19.2-13.3`

Simplify:

`x=5.9`