Question

In a normally distributed population of camshaft diameters, 70% of the camshafts are greater than 33.40 millimeters in diameter. State this as a percentile.

Answer 1

A. In this population, the percentile ranking of a 33.40 millimeter diameter camshaft is between 30 and 31.
B. In this population, a 33.40 millimeter diameter camshaft is at the 40th percentile.
C. In this population, a 33.40 millimeter diameter camshaft is at the 30th percentile.
D. In this population, the percentile ranking of a 33.40 millimeter diameter camshaft can't be calculated with the information given
E. In this population, a 33.40 millimeter diameter camshaft is at the 70th percentile

Answer 2

@Directrix @jim_thompson5910

Answer 3

what did you get?

Answer 4

C.

Answer 5

the percentile can be calculated actually

Answer 6

example: 54th percentile means 54% of the population is below this marker

Answer 7

if you say "20% of the population is above marker X, then marker X is at the 80th percentile"

since 100% - 20% = 80%

Answer 8

yea thats why i thought it was at the 30th, i did 100-70=30

Answer 9

yep, it's the 30th percentile since 70% is above, 30% is below

Answer 10

thats C. isn't it?

Answer 11

oh my bad

Answer 12

I mixed up C and D and thought you said it couldn't be calculated

Answer 13

ohhh, so was i right about it being C. ?

Answer 14

correct

Answer 15

Ok thanks!

Answer 16

np