Math 115 Quiz 3
Spring 08
Name:____________________
1.
The variable ‘height in inches’ of adult male German Shepherd dogs is modeled
with a Normal distribution.
The graph below displays the distribution of this
variable.
Use this graph to estimate the mean height of adult male German
Shepherds, and the standard deviation of the ‘height in inches’ variable.
1 point
17
19
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31
33
2.
The following is a density curve representing the distribution of a variable.
Draw
a vertical line through the mean value of this variable, and a vertical line through
the median value of this variable.
Be sure to label each line.
1 point

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3.
Suppose the score on a university exam is Normally distributed with a mean of 68
points and a standard deviation of 9 points.
Use the 68-95-99.7 rule to estimate
the percent of students who score above 77?
1 point
4.
Suppose the time to complete a standardized exam is approximately Normal with
a mean of 70 minutes and a standard deviation of 10 minutes.
Use the 68-95-99.7

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