Find the requested percentiles and percentile ranks for the following distribution of quiz scores for a class

Question:

Find the requested percentiles and percentile ranks for the following of quiz scores for a class of N = 40 students.

f of c% х 20 2 40 100,0 19 4 38 95.0 18 34 85.0 17 13 28 70.0 16 15 37.5 22.5 15 14 12.5 13 2 5.0

a. What is the percentile rank for X = 15?
b. What is the percentile rank for X = 18?
c. What is the 15th percentile?
d. What is the 90th percentile?

Distribution
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