Product of X andY is less than or equal to 4

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?

How many ordered pairs of positive integers satisfy xy=32?