Question

A student has gotten the following grades on his tests:89, 94, 75, 79. What is the minimum grade he must get on the last test in order to have an average of 83?

Answer 1

Step-by-step explanation:

Let the minimum grade that the student must get = y

Expected average grade = 83

Therefore:

`(89+94+75+79+y)/(5)=83`

We solve the equation above for y:

`\begin{gathered} (89+94+75+79+y)/(5)=83 \\ 89+94+75+79+y=83*5 \\ 337+y=415 \\ y=415-337 \\ y=78 \end{gathered}`

The minimum grade required to get an average of 83 is