Mrs. Burke’s physics class has 109
students, classified by academic year and major, as illustrated in the table. Mrs. Burke randomly chooses one student to collect yesterday’s work.
Mrs. Burke’s Physics Class
Academic Year Physics Majors Non-Physics Majors
Freshmen 13
14
Sophomores 13
17
Juniors 14
13
Seniors 9
16
Step 1 of 2 : What is the probability that she selects a physics major, given that she chooses randomly from only the freshmen? Enter a fraction or round your answer to 4
decimal places, if necessary.
The total number of freshmen in the class is 13 + 14 = 27.
The probability of selecting a physics major from the freshmen is 13/27 ≈ 0.4815.