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?

Answer 2

10

Answer 3

and 30% of 10 = 3, but that is a whole number so we want the average of the 3rd and 4th positions once the numbers are placed in order from small to big

Answer 4

for the 90th percentile; 90% of 10 is what?

Answer 5

9

Answer 6

and since 9 is a whole number, we want to average the 9th and 10th positions to determine the 90th percentile

Answer 7

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

Answer 8

hmm, they seem to be using a different definition for percentile

Answer 9

I got the average as 188 for 90th percentile

Answer 10

assume we wanted the 50th percentile, also known as the median.

50% of 10 = 5; according to this problem, that would mean we would have to decide between 129 and 132 for the median; which is absurd.

Answer 11

the choices dont reflect the correct procedures ...

Answer 12

if i were to take a guess; and this is a 50/50 scenario, id assume they are wanting "c"

Answer 13

I thought the same but when i guessed C i got it wrong =/

Answer 14

try b?

Answer 15

ok thanks I'll try B and then ask my teacher for credit if I get it wrong

Answer 16

i just dont see a "correct" option ...

Answer 17

good luck ;)

Answer 18

thanks :D