Exhibit 11-5
Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.
We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year.
-Refer to Exhibit 11-5. The expected number of freshmen is
A)83
B)90
C)30
D)10

Question

Exhibit 11-5
Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.
  We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year.
-Refer to Exhibit 11-5. The expected number of freshmen is
A)83 
B)90 
C)30 
D)10

Quizplus · Accepted Answer

The expected number of freshmen can be calculated by multiplying the total sample size (300) by the percentage of freshmen in last year's student body (30% = 0.3):

Expected number of freshmen = 300 x 0.3 = 90

Therefore, the best choice is B.

Exhibit 11-5 Last School Year, the Student Body of a Local University