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December 18, 2014

Homework Help: statistics

Posted by Lezlie on Sunday, January 27, 2008 at 6:39pm.

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 20 100
80-89 7 16 35 80
70-79 4 9 20 45
60-69 3 5 15 25
50-89 2 2 10 10
a)Using interpolation find the 30th percentile.

The answer I came up with was 72.

B) FIND THE 88TH PERCENTILE

93.5

C) WHAT IS THE PERCENTILE RANK FOR X=77

40th percentile

D) WHAT IS THE PERCENTILE RANK FOR X=90

81st percentile


-Are my answers correct. I did the % portion of the table myself. I'm not sure if I did it correctly though.

Thank You

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