Question

A group of forty-eight eight grade students was surveyed to find out much time they spent studying for their final exam and their final grade. The table below summarizes the responses.

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Exam grade of 80% Exam grade less than
or higher 80%
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Studied 4 or 18 6
more hours
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Studied less
than 4 hours 10 14
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What percent of students who took the exam scored an 80 or above on the exam?

Answer 1

58.33333%

Explanation:

Exam ≥ 80% Exam < 80%

Studied 4+ hours 18 6

Studied < 4 hours 10 14

The number of students who took the exam is 18+10+6+14 =48

The number of students who got an 80 or above is 18+10 = 28

The percent with 80 or above is 80 or above over total

28/48

.5833333