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rodikova [14]
3 years ago
6

Going into the final​ exam, which will count as two​ tests, Amelia has test scores of 79 comma 80 comma 70 comma 65 comma and 92

. What score does Amelia need on the final in order to have an average score of​ 80?
Social Studies
1 answer:
anygoal [31]3 years ago
6 0

Answer:

Amelia needs to make 87 on the final.

Explanation:

Let final test grade is x

Average =\frac{sum\ of\ all\ test\ grades}{number\ of\ tests}

amelia has taken total number of  5 tests before and the  final exam is equivalent to 2 test therefore total test is 7 in number  

Using the  above formula:

80 = \frac{79 + 80 + 70 + 65 + 92 + x + x}{7}

80 =\frac{386 + 2x}{7}



7*80 = 386 + 2x


 560 = 386 + 2x

174 = 2x

87 = x

Amelia needs to make 87 on the final.

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