Answer:
a. 81%
b. 91%
Step-by-step explanation:
78% × 82% + 85% + 79%
= 324
= 324 ÷ 4
= 81
so, his average score for the 4 math tests is 81%.
83 × 5
= 415
= 415 - 324
= 91
therefore, Marvin must get 91% in his 5th test to get a total average of 83%.
b.91
a) 78%+82%+85%+79%= 324%
324%÷4=81%
b)78%+82%+85%+79%+91%= 415%
415%÷5= 83%
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Answers & Comments
Answer:
a. 81%
b. 91%
Step-by-step explanation:
78% × 82% + 85% + 79%
= 324
= 324 ÷ 4
= 81
so, his average score for the 4 math tests is 81%.
83 × 5
= 415
= 415 - 324
= 91
therefore, Marvin must get 91% in his 5th test to get a total average of 83%.
Answer:
a. 81%
b.91
Step-by-step explanation:
a) 78%+82%+85%+79%= 324%
324%÷4=81%
b)78%+82%+85%+79%+91%= 415%
415%÷5= 83%