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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?

Respuesta :

Answer:

Explanation:

Let the minimum grade that the student must get = y

Expected average grade = 83

Therefore:

[tex]\frac{89+94+75+79+y}{5}=83[/tex]

We solve the equation above for y:

[tex]\begin{gathered} \frac{89+94+75+79+y}{5}=83 \\ 89+94+75+79+y=83\times5 \\ 337+y=415 \\ y=415-337 \\ y=78 \end{gathered}[/tex]

The minimum grade required to get an average of 83 is

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