The accounting department at Weston Materials Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 31 hours and a standard deviation of 2 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 27 and 36 hours. (Negative answers should be indicated by a minus sign. Round the final answers to 1 decimal place.)

27 hours corresponds to z =

36 hours corresponds to z =

a-2. What percentage of the garages take between 31 hours and 36 hours to erect? (Round the final answer to 2 decimal places.)

Percentage %

b. What percentage of the garages take between 27 hours and 36 hours to erect? (Round the final answer to 2 decimal places.)

Percentage %

c. What percentage of the garages take 26.8 hours or less to erect? (Round the final answer to 2 decimal places.)

Percentage %

d. Of the garages, 8% take how many hours or more to erect? (Round the final answer to 1 decimal place.)

Hours

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