percentage?

he accounting department at Weston Materials Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 48 hours and a standard deviation of 2 hours to erect the Red Barn model. Assume the assembly imes follow the normal distribution. Refer to the table in Appendix B.1. -1. Determine the z-values for 45 and 50 hours. (Negative answers should be indicated by a minus sign. Round the final answers to 1 decimal place.) 45 hours corresponds to z = 50 hours corresponds to z = a-2. What percentage of the garages take between 48 hours and 50 hours to erect? (Round the final answer to 2 decimal places.) Percentage 9% b. What percentage of the garages take between 45 hours and 50 hours to erect? (Round the final answer to 2 decimal places.) Percentage % c. What percentage of the garages take 44.2 hours or less to erect? (Round the final answer to 2 decimal places.) Percentage 9% d. Of the garages, 9% take how many hours or more to erect? (Round the final answer to 1 decimal place.) Hours