The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students,find the frequency for the highest two grades.
A)44
B)118
C)59
D)74
E)35

Question

The following is a relative frequency distribution of grades in an introductory statistics course.  If this was the distribution of 200 students,find the frequency for the highest two grades.
A)44 
B)118 
C)59 
D)74 
E)35

Quizplus · Accepted Answer

The highest two grades are A and A-. According to the relative frequency distribution, these two grades occur with a frequency of 0.41 and 0.235, respectively.

Total number of students = 200

Frequency of A = 0.41 x 200 = 82

Frequency of A- = 0.235 x 200 = 47

Therefore, the frequency for the highest two grades (A and A-) is 82 + 47 = 129, which is closest to option B (118).

The Following Is a Relative Frequency Distribution of Grades in an Introductory