Florida International University
Business Statistics - STA 2023
Ms. Laura Reisert Instructor
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Chapter 3-A Supplelmentary Exercises
Four hundred students
have been classified according to their current academic status and sex.
The results are given in the table below:
| Freshman | Sophomore | Junior | Senior | |
| Male | 20 | 30 | 70 | 60 |
| Female | 50 | 50 | 80 | 40 |
a. What proportion of the students are female?
b. What proportion of the students are not juniors?
c. If a student is selected at random from this group, what is the probability the student is a senior and male?
d. What is the probability that a randomly selected male is not a freshman?
e. What is the probability that a randomly selected student is a junior or female?
f. What is the probability that a randomly selected junior is female?
g. What is the probability that a randomly selected male is either a freshman or sophomore?
h. What is the probability that a randomly selected student is not a senior and not female?