A livestock company reports that the mean weight of a group of young steers is 1172pounds with a standard deviation of 70pounds.

A livestock company reports that the mean weight of a group of young steers is 1172pounds with a standard deviation of 70pounds. Based on the model N(1172,70)for the weights of steers, what percent of steers weigh

a) over 1100pounds?

b) under 1250pounds?

c) between 1200 and 1300 pounds?