When does making a line plot of the numbers below 11.25,12.5,11.25,14.125,10.5,11.25, 12

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

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?