Ahouse blueprint has a scale of i in : 4 pl-the length and width of each room in the actual house are shown in me able complete 1 a 1 . the table by finding the length and width of each room on the blueprint ‘ ' ‘ 7 ~ wm ; , a . , . 16x20 12x12 8x12 20 x12 12x12 6x8 hank ’ ‘

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.