The following frequency distribution presents a set of exam

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

x f cf c%

90-99.....4 ... 20... 100

80-89.... 7 .....16..... 80

70-79 ....4 .......9...... 45

60-69.... 3....... 5....... 25

50-59..... 2...... 2......... 10

a) Find the 30th percentile.

b) What is the percentile ranking for X=77?

Reference no: EM13605948

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