Question

Medal and fan! (:
Find the value of the 90th percentile of the following set of data.

18, 9, 7, 5, 11, 7, 17, 20, 19, 2, 17, 12, 5, 1, 13, 12, 11, 15, 16, 20

Answer 1

first sort the data set from smallest to largest and tell me what you get

Answer 2

1, 2, 5, 5, 7, 7, 9, 11, 11, 12, 12, 13, 15, 16, 17, 18, 19, 20, 20

Answer 3

17 happens twice

Answer 4

so you are missing one value, 17

Answer 5

oh oops i knew i forgot one

Answer 6

that's ok, there's a lot to keep track of

Answer 7

1, 2, 5, 5, 7, 7, 9, 11, 11, 12, 12, 13, 15, 16, 17, 17, 18, 19, 20, 20

Answer 8

the sorted list is

1, 2, 5, 5, 7, 7, 9, 11, 11, 12, 12, 13, 15, 16, 17, 17, 18, 19, 20, 20

Answer 9

better

there are 20 values

Answer 10

so 90% of 20 is 0.9*20 = 18

this means that at slot 18, the 90th percentile will be located here

Answer 11

in slot 18 is the number 19 (they couldn't make this any more confusing lol)

so 19 is the 90th percentile

Answer 12

Oh okay wow thats really confusing haha thanks though (:

Answer 13

you're welcome