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. a-1. determine the z values for 29 and 34 hours. (negative amount should be indicated by a minus sign. round z value to 2 decimal places and your final answer to 2 decimal places.) a-2. what percent of the garages take between 32 hours and 34 hours to erect? (round z value to 2 decimal places and your final answer to 2 decimal places.) b. what percent of the garages take between 29 hours and 34 hours to erect? (round z value to 2 decimal places and your final answer to 2 decimal places.) c. what percent of the garages take 28.7 hours or less to erect? (round z value to 2 decimal places and your final answer to 2 decimal places.) d. of the garages, 5% take how many hours or more to erect? (round your answer to 1 decimal place.)