Question

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 does Megan need on the final exam in order to have an average of 90?

Answer 1

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.