Stat 250 Fall 1998 Name ________________________________
Activity #7: Normal distribution Student ID __ __ __ - __ __ - __ __ __ __
Section #    1      2
 
Form a group of 3 students.  You will be given 10 minutes to complete this activity.

First, answer the following question:

In the past 24 hours, to the nearest quarter-hour, how many hours did you sleep?

___ ___ . ___ ___ hours

Data collected on Stat 250 students in a previous semester suggests that X, the amount of sleep in hours in a 24-hour period, is normally distributed with a mean, m, of 6.75 and a standard deviation, s, of 1.25.  Assume this describes the sleep habits of this semester's Stat 250 students as well.

Consider the person in your group who slept the most.
He/she slept ___ ___ . ___ ___ hours.
Find the percentage of Stat 250 students who slept longer than this person.
 
 
 
 
 
 
 

Consider the person in your group who slept the least.
He/she slept ___ ___ . ___ ___ hours.
Find the percentage of Stat 250 students who slept less than this person.
 
 
 
 
 
 
 

Consider the person in your group who did not sleep the least or the most.
He/she slept ___ ___ . ___ ___ hours.
Find the percentage of Stat 250 students who slept between this person and the most person......I mean, the percentage of students who slept between the amount this person slept and the amount the most person slept.