Question

The scores on an exam are normally distributed with a mean of 77 and a standard deviation of 10. What percent of the scores are greater than 87?

68%
16%
84%
2.5%

Answer 1

The z-score for an exam score of 87 is 1.
A standardised normal distribution table will give you the percentage of exam scores less than 87. Then just subtract this percentage from 100% to get the solution.

Answer 2

so what is the answer

Answer 3

?

Answer 4

Just look up the table here for Z = 1.00 and follow the instructions that I posted:
http://faculty.mu.edu.sa/public/uploads/1335623341.239standardnormaltable.pdf

Answer 5

do you have a ti 89?

Answer 6

yeah

Answer 7

i have ti 83

Answer 8

You can do it on you calc by going to apps, look for stats/list, then press f5 and select shade. let me know when you'r there.

Answer 9

Oh and 83 is diff.

Answer 10

This websit should help http://www.ehow.com/how_4523946_find-normal-distribution-ti83-calculator.html

Answer 11

i just wanna know if u can tell me the answer

Answer 12

It looks like 15.86% round to 16 %. You should learn how to do it on your calc its easy.

Answer 13

thanks

Answer 14

no problem