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sweet [91]
3 years ago
14

Russells previous test scores are 70,74,87,85 what score does he need to get an average of 80

Mathematics
2 answers:
s344n2d4d5 [400]3 years ago
8 0
70+74+87+85 = 316
For the 5th test score, an 80 average needs 400 as the total score.  So 400-316 = 84 on the next test.
Ludmilka [50]3 years ago
3 0

Answer:

84 is the score that you Russell needs on the next test to achieve an average of at least 80.

Step-by-step explanation:

Russell's test scores are:  70,74,87 and 85

Average of the test scores = A = 80

Let thescore needed to achieve an average of 80 be x

Average = \frac{\text{Sum of terms}}{\text{Number of terms}}

A=\frac{70+74+87+85+x}{5}

80=\frac{70+74+87+85+x}{5}

70+74+87+85+x=400

x=400-(70+74+87+85)=84

84 is the score that you Russell needs on the next test to achieve an average of at least 80.

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