Question

WILL FAN AND MEDAL

The grades on the last art exam had a mean of 75%. Assume the population of grades on art exams is known to be distributed normally, with a standard deviation of 7%. Approximately what percent of students earn a score between 75% and 82%?

37.2%
84.1%
34.1%
50%

Answer 1

ohh snap, these problems! X_X

Answer 2

I know that i need to use the z-Score formula, But now when it says "between %75 and %82"

ZSCORE = \[z= \frac{ \mu - x }{ }\]

Answer 3

whoops theres supposed to be a sigma under that

Answer 4

hmmm

Answer 5

@pooja195 help please? im not very good with this stuff! :)

Answer 6

@Luigi0210 :)

Answer 7

yay!! help has arrived!

Answer 8

Don't know much stats, sorryy

@imqwerty

Answer 9

qwerty, you better help this kid! :)

Answer 10

damn this is statistics!!!

Answer 11

@graysongraddylol do you still need help? :)

Answer 12

Yes I do @Hayleymeyer

Answer 13

okay, ima find you some help, cuz you seem nice

Answer 14

@phi

Answer 15

thank you :)

Answer 16

anytime!

Answer 17

@Nnesha

Answer 18

@phi

Answer 19

@freckles

Answer 20

mean of 75%.
standard deviation of 7%

score between 75% and 82%?

(it is a bit confusing because our measurements are percents (on a test)... and we also have percent (under a curve) )

but we want the area under the bell curve from 75% (the mean) and 82% (which is 1 std dev to the right of the curve)

how much area is between the mean and 1 std dev from the mean
do you know how to figure that out ?

Answer 21

i have no clue what a standard deviation is :(

Answer 22

yay! you got help!!

Answer 23

do you know what a bell curve looks like?

Answer 24

Like this.?