Crafter's warehouse sells 3 yards of gray tulle for $5.63 . they sell 6 feet of black tulle for $3.58 . which tulle has the better price ?

a ; both tulles have the same price per foot .

b ; the gray tulle has a better price .

c ; the black tulle has a better price .

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.

Math it's appreciated. (picture provided)

What is the product? a-3/15a × 5/a-3