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.

Exam grade of 80% Exam grade less than
or higher 80%

Studied 4 or 18 6
more hours

Studied less
than 4 hours 10 14

What percent of students who took the exam scored an 80 or above on the exam?

58.33333%

Step-by-step 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

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17