Sammy went to dinner at his favorite sandwich shop. His total bill cost $14.60
before tax.
The cost of his drink can be
represented by x.
The cost of his sandwich is 4 times the
cost of his drink.

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.