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The accounting department at Weston Materials Inc., a national manufacturer of unattached garages, reports that it...

The accounting department at Weston Materials Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 39 hours and a standard deviation of 5 hours to erect the Red Barn model. Assume the assembly times follow the normal distribution. Refer to the table in Appendix B.1.

a-1. Determine the z-values for 34 and 44 hours. (Negative answers should be indicated by a minus sign. Round the final answers to 1 decimal place.)

34 hours corresponds to z =           

44 hours corresponds to z =           

a-2. What percentage of the garages take between 39 hours and 44 hours to erect? (Round the final answer to 2 decimal places.)

Percentage            %

b. What percentage of the garages take between 34 hours and 44 hours to erect? (Round the final answer to 2 decimal places.)

Percentage            %

c. What percentage of the garages take 33.8 hours or less to erect? (Round the final answer to 2 decimal places.)

Percentage            %

d. Of the garages, 9% take how many hours or more to erect? (Round the final answer to 1 decimal place.)


Hours           

math   Statistics-And-Probability   
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