The number of homes sold each year by a realtor is normally distributed with a mean of
54. If the realtor sold 36 homes last year
with a z-score of -2.4, what is the standard
deviation?

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.