A livestock cooperative reports that the mean weight of yearling Angus steers is 1120 pounds. Suppose that the weights of all such animals can be described by a Normal model with a standard deviation...

Extracted text: A livestock cooperative reports that the mean weight of yearling Angus steers is 1120 pounds. Suppose that the weights of all such animals can be described by a Normal model with a standard deviation of 64 pounds a) What percent of steers weigh over 1100 pounds? b) What percent of steers weigh under 1050 pounds? c) What percent of steers weigh between 900 and 1300 pounds?