Question

Find the values of the 30th and 90th percentiles of the data. 129, 113, 200, 100, 105, 132, 100, 176, 146, 152
A. 30th percentile = 105; 90th percentile = 200

B. 30th percentile = 113; 90th percentile = 200

C. 30th percentile = 105; 90th percentile = 176

D. 30th percentile = 113; 90th percentile = 176

Answer 1

how many numbers are there in the data set?

Answer 2

there are ten numbers

Answer 3

a percentile is a division by 100 ... as opposed to a quartile which is a division by 4

n/100 = 1 percentile

30* n/100 gets us to about the 30th percentile

Answer 4

and sorting the values from small to large tends to be a good idea in order to pick out the 30th 'order'

Answer 5

the wolf sorts it easily:

100, 100, 105, 113, 129, 132, 146, 152, 176, 200

http://www.wolframalpha.com/input/?i=sort%7B+129%2C+113%2C+200%2C+100%2C+105%2C+132%2C+100%2C+176%2C+146%2C+152%7D

Answer 6

so, 30*10/100 = 3. ideally we would want to take an average of the 3rd and 4th positions but that doesnt seem to be an option in the answers.

Answer 7

so is it B?

Answer 8

dunno, the only one that makes sense to me as an option is the 3rd and 9th values

Answer 9

let me see i think it is C. (And nice pic!)

Answer 10

well C is wrong

Answer 11

C makes the most sense .. so at this point its anyone guess

Answer 12

okay lets see are u on a test?

Answer 13

no

Answer 14

Try B. then i think that is the next closest

Answer 15

http://growingknowing.com/GKStatsBookPercentile.php

Answer 16

nice but a little long lol

Answer 17

ok

Answer 18

the excel of it gives us 110 and 178, which arent options either

Answer 19

thanks

Answer 20

good luck