Posted by **badel** on Thursday, November 18, 2010 at 11:50pm.

The average time a student spends studying just prior to a test is 36 minutes with a standard deviation of 5 minutes. This distribution approximates a normal curve. Find the percent of students who study just prior to the test for. a) more than 40 minutes b) between 35 and 45 minutes

- Stat -
**Brandon**, Friday, November 19, 2010 at 2:44am
ncdf(40,1000,36,5)=.212 a)

ncdf(35,45,36,5)=.543 b)

its been a while so im not 100% sure if its right but i think it is :)

dont forget to draw the normal curves on your assignment my teachers alwyas made me haha

- statistics -
**PsyDAG**, Friday, November 19, 2010 at 10:32am
Z = (score-mean)/SD

Calculate the various Z scores.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to these Z scores

## Answer this Question

## Related Questions

- statistic - . The average time a student spends studying just prior to a test is...
- college statistics - the average length of time required for students to ...
- Statistics - "Working Mom’s Journal" reported that the mean time a mother, with ...
- intro to statistics - "Working Mom’s Journal" reported that the mean time a ...
- statistics - A student claims the average amount of time spent studying for an ...
- DBU - The mean time to complete a psychology exam is 34 minutes with a standard ...
- Statistics - If we know that the length of time it takes a college student to ...
- Statistics - A recent study of US children under 11 years old found that they ...
- statistic - Over the past 10 years, the local school district has measured ...
- Statistics - The average time a visitor spends at the Renzie Park Art Exhibit is...