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kotegsom [21]
3 years ago
5

Going into the final exam, which will count as 1/3 of the final grade, Megan had test scores of 94, 81, 87, and 93. What score d

oes Megan need on the final exam in order to have an average of 90?
Mathematics
1 answer:
sergeinik [125]3 years ago
3 0

9514 1404 393

Answer:

  92.5

Step-by-step explanation:

The total of Megan's scores is ...

  94 +81 +87 +93 = 355

so her current average is 355/4 = 88.75

The score (s) Megan needs for a 90 average is ...

  (2/3)(88.75) +(1/3)s = 90

  2(88.75) +s = 270 . . . . . . . . multiply by 3

  s = 270 -177.5 = 92.5

Megan needs a score of 92.5 on her final to have an overall average of 90.

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