Krysta wants to get a sandwich from the deli for lunch. She can pick a tuna, roast beef, ham, chicken salad, or vegetarian sandwich. The bread choices are rye, wheat, or multi-grain. She can have provolone, cheddar, or American cheese, and she can pick one sauce. The sauce choices are pepper spread, dijon, pesto, mustard, and mayonnaise. How many different combinations can Krysta pick from?

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.