The following frequency distribution presents a set of exam scores for a class of N = 20

Question:

The following frequency presents a set of exam scores for a class of N = 20 students.

х f cf c% 90-99 100 4. 20 80-89 16 80 70-79 4 45 60-69 3 25 50-59 2 10 2.

a. Find the 30th percentile.
b. Find the 88th percentile.
c. What is the percentile rank for X = 77?
d. What is the percentile rank for X = 90?

Distribution
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