Question

Betsy is testing whether school is more enjoyable when students are making high grades. She asked 150 students if they enjoyed school and whether their GPA was above or below 3.5. She found that 35 of the 60 students with a GPA above 3.5 reported that they enjoyed school, and 15 of the 90 students with a GPA below 3.5 reported that they enjoyed school. What is the probability that a student with a GPA below 3.5 does not enjoy school?

Answer 1

Of the total number of students who have GPA below 3.5, which amounts to a total of ninety, fifteen of them have declared themselves enjoying school. If the question is how much probability, of the total number of GPA students below 3.5 does not enjoy school, then that probability would be:

the percentage of students who does not enjoy school is calculated

((90 - 15) / 90) x 100% = (75/90) x 100% = 0,83 x 100% = 83%.

Answer 2

The probabiility that  a student with a GPA below 3.5 enjoys school is 15/90 = 1/6.
probability a student get a GPA below 3.5 doesn't enjoy school is: 1-1/6 = 0.83.

hope this help