Thomas R. answered • 05/15/18

Tutor

4.9
(1,318)
A.S. in math, with over 25 years of classroom experience

Okay, we can do this! First, we need to add up all of the scores, even the ones we don't know yet:

**92 + 87 + 89 + 94 + X**

**362 + X**

Now then: we need to find the average grade, and that means totaling them up (we did that already!) and dividing by the number of terms (5). Like this:

**(362 + x) / 5 ≥ 90**

Multiply both sides by 5 and we get:

**362 + X ≥ 450**

**-362 -362**

**X ≥ 88**See? We're done already!