Question

John scored 75, 82, 66, and 78 on his history tests. What score must John get on his next test in order to have a mean score of 76?

Answer 1

[75 + 82 + 66 + 78 + x ] / 5 = 76

301 + x = 380

x = 79

Answer 2

Answer:

In the next test John must get $79$

Step-by-step explanation:

Let

x------> the score in the next test

we know that

The formula to calculate the mean is the sum of the scores divided by the number of test

so

$76=\frac{75+82+66+78+x}{5}$

Solve for x

$76=\frac{301+x}{5}\\ \\x=76*5-301\\ \\x=79$