The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose that weights of all such animals can be described by a normal model with a standard deviation of 84 pounds.
a) What percent of steers weigh over 1200 pounds?
b) What percent of steers weigh under 1175 pounds?
c) What percent of steers weigh between 1075 and 1150 pounds?