Saturday

December 20, 2014

December 20, 2014

Posted by **Anonymous** on Monday, August 18, 2014 at 9:27am.

On a week night, what percentage of students sleep between 5 and 10 hours

- statistics -
**Reiny**, Monday, August 18, 2014 at 10:36amPerfectly suited for David Lane's great stats calculator

Just enter the values from your problem

http://davidmlane.com/hyperstat/z_table.html

I get 84.15%

If you must use your tables,

z-score for 10 = (10-7)/1.7 = 1.7647

z-score for 5 = (5-7)/1.7 = -1.17647

look up probability for 1.7647 in your tables

look up probability ofr -1.17647

subtract the two values to get .8415

**Answer this Question**

**Related Questions**

AP Statistics - A school psychologist reports that the mean number of hours the ...

statistics - College students average 7.8 hours of sleep per night with a ...

statistics - researchers believe a new sleep on average 10 hours per night...

statistics - The typical amount of sleep per night for undergraduate college ...

statistics - Question 1 A school psychologist reports that the mean number of ...

Statistics (37) - According to the Sleep Foundation, the average night's sleep ...

Economics (37) - According to the Sleep Foundation, the average night's sleep is...

Probability/Statistics - Using diaries for many weeks, a study on the lifestyles...

statistics - To determine how many hours per week freshmen college students ...

Statistics - the average numbers of hours a cat sleep is approximately normally...