Question

Twenty-four students took a test. Fourteen students earned an A and 8 students earned a B. A student will be randomly chosen. What is the probability that the student earned an A on the last test? Enter your answer as a fraction, in simplest form, in the box.

Answer 1

total no of students=24
students who scored A=8
probability of picking an A student=8/24=1/3

Answer 2

1. n(event)=n("student earning A")=14

2. n(sample space)=n(all students involved in this "experiment")=n(S)=24

3. p("student earning A")=n("student earning A")/n(S)=14/24=7/12

4. Remark: p(event)=n(event)/n(sample space)