Problem of the Day Kendra compares the unit rates for the following four boxesof cereal so she can choose the one that is the best value.

Which box of cereal should she choose?

A. 32 ounces for $3.84
B. 16 ounces for $1.76
C. 18 ounces for $2.52
D. 24 ounces for $1.92

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.