The weights of cars passing over a bridge have a mean of 3,550 pounds and standard deviation of 870 pounds. Assume that the weights of the cars passing over the bridge are

normally distributed. Determine the probability of each instance, and explain how you found each answer.

a. The weight of a randomly selected car is more than 4,000 pounds.

b. The weight of a randomly selected car is less than 3,000 pounds.

c. The weight of a randomly selected car is between 2,800 and 4,500 pounds