find the 80th percentile?

Question

A sample of 100 clients of an exercise facility was selected. Let X = the number of days per week that a randomly selected client uses the exercise facility.

X Frequency

0 2

1 14

2 33

3 28

4 10

5 9

6 4

Find the 80th percentile.

_____

Answer 1

The 80th percentile is the value of which 80% of the values are below. Since 77 are below, x=4 and x=4 has a count of 10, 4 is the 80th percentile.