A livestock company reports that the mean weight of a group of young steers is 1121 pounds with a standard deviation of 79 pounds. Based on the model N(1121​,79​) for the weights of​ steers, what percent of steers weigh ​a) over 900 pounds? ​b) under 1200 pounds? ​c) between 1150 and 1250 pounds?

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