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hmm, id have to know what your material has covered so far

and what you have to work the problem with

it feels to me like an empirical rule approximation tho ...

it is indeed, but im not sure how to use it

well, determine how many deviations are between the mean and your end points

what is our mean?

89%

and what is our left end point?

75%

with a standard deviation of 14%

so, the difference between them is:
what is 89-75?

14

which is exactly 1 standard deviation to the left of the mean. right?

I didnt get it, can you elaborate more?

and do we have options to choose from?

68% will fall within the first standard deviation, 95%, the first two and 99.7 first three

the options are:
38.5%
15.7%
50%
34.1%

|dw:1437697237025:dw|

I'm lost on this....

it as plain as i can make it, you will have to tell me where it is losing you at.

I dont know what "that tell us"

we determined how many standard deviations we are to the left of the mean, didnt we?
89-75 = ??

14

ohh ok I think I get it

the answer would be 34% of the students will get between 75 and 89

34.1%

thats what I would go with as well :)

got it right thanks

good luck