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

Answer:

5.9

Step-by-step 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:

$\frac{3.8+4.2+5.3+x}{4}=4.8$

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:

$x=5.9$