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# Weston Materials: Determining Z Values

Each response must include your calculations.

The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model. Assume the assembly times follow the normal distribution.

Complete the following:

a Determine the z values for 29 and 34 hours. What percent of the garages take between 32 and 34 hours to erect?
1 z value for 29 hours
2 z value for 34 hours
3 percent of garages taking between 32 and 34 hours to erect.

b What percent of the garages take between 29 hours and 34 hours to erect?
percent of garages taking between 29 and 34 hours to erect.

c What percent of the garages take 28.7 hours or less to erect?
percent of garages taking less than 28.7 hours to erect.

d Of the garages, 5 percent take how many hours or more to erect?
hours needed to erect 5 percent of the garages

#### Solution Summary

This solution provides assistance in determining the z-values for Weston Materials.

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