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Bas_tet [7]
3 years ago
8

Maria's first four test scores were 60, 90, 90, and 70. What what does she need to make on the fifth test to maintain a 70 avera

ge?
Mathematics
2 answers:
Marta_Voda [28]3 years ago
4 0

Answer:

She needs to get a score of 40 on the fifth test to maintain a 70 average

Step-by-step explanation:

The idea is to calculate an average among the scores. The formula is the sum of all scores divided between the number of scores.

average = \frac{sum\, of\, scores}{number\, of\, scores}

First step

If the idea is to include a fifth score to maintain an average of 70, it should be included in the equation as a variable x. According to the previous equation:

70 = \frac{60+90+90+70+x}{5}

The next step is to find x.

x = (70)\times (5) - (60+90+90+70) = 40

Conclusion

Hence, she needs to get a score of 40 on the fifth test to maintain a 70 average.

snow_lady [41]3 years ago
3 0
A 40 is the lowest she can make and that would give her exactly a 70 average. 
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