A frequency distribution for the class level of students in Professor Weiss's introductory statistics course is as

Question:

A frequency distribution for the class level of students in Professor Weiss's introductory statistics course is as follows.

Class __________________ Frequency

Freshman ........................... 6

Sophomore .........................15

Junior ...............................12

Senior ............................... 7

Two students are randomly selected without replacement. Determine the probability that

a. The first student obtained is a junior and the second a senior.

b. Both students obtained are sophomores.

c. Draw a tree diagram for this problem similar to Fig. 4.25 on page 194.

d. What is the probability that one of the students obtained is a freshman and the other a sophomore?

Distribution
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