How many students who studied for the quiz passed? What is the total number of students who studied?
0.95
Practice makes perfect
We have a two-way frequency table that shows information about the students who took a quiz. Since we want to know the relative frequency of selecting a student who studied for the quiz and passed, let's highlight the number of students who studied for the quiz and passed and the total of students who studied.
Studied
Did not study
Totals
Passed
19
7
26
Failed
1
4
5
Totals
20
11
31
Let's now find the relative frequency of selecting a student who studied for the quiz and passed when choosing a student at random.
P(Studied and passed)&=Studied and passed/Studied [1em]
P(Studied and passed)&=19/20=0.95
