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1) Civil engineers believe that W, the amount of weight (in units of 1,000 pounds) that...

1) Civil engineers believe that W, the amount of weight (in units of 1,000 pounds) that a certain span of a bridge can withstand without structural damage resulting, is normally distributed with mean 400 and standard deviation 40. Suppose that the weight (again, in units of 1,000 pounds) of a car is a random variable with mean 3 and standard deviation 0.3. How many cars would have to be on the bridge span for the probability of structural damage to a. Exceeds 0.1? b. Exceeds 0.5?

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