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Vitek1552 [10]
3 years ago
12

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?
Mathematics
2 answers:
Pachacha [2.7K]3 years ago
3 0
[75 + 82 + 66 + 78 + x ] / 5 = 76

301 + x = 380

x = 79
Bas_tet [7]3 years ago
3 0

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


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