# Question: A construction zone on a highway has a posted speed

A construction zone on a highway has a posted speed limit of 40 miles per hour. The speeds of vehicles passing through this construction zone are normally distributed with a mean of 46 miles per hour and a standard deviation of 4 miles per hour. Find the percentage of vehicles passing through this construction zone that are

a. Exceeding the posted speed limit

b. Traveling at speeds between 50 and 57 miles per hour

a. Exceeding the posted speed limit

b. Traveling at speeds between 50 and 57 miles per hour

## Relevant Questions

The Bank of Connecticut issues Visa and MasterCard credit cards. It is estimated that the balances on all Visa credit cards issued by the Bank of Connecticut have a mean of $845 and a standard deviation of $270. Assume that ...One of the cars sold by Waltâ€™s car dealership is a very popular subcompact car called Rhino. The final sale price of the basic model of this car varies from customer to customer depending on the negotiating skills and ...Find the value of z so that the area under the standard normal curve a. From 0 to z is .4772 and z is positive b. Between 0 and z is (approximately) .4785 and z is negative c. In the left tail is (approximately) .3565 d. In ...According to the records of an electric company serving the Boston area, the mean electricity consumption during winter for all households is 1650 kilowatt-hours per month. Assume that the monthly electric consumptions ...Find the following binomial probabilities using the normal approximation. a. n = 70, p = .30, P(x = 18) b. n = 200, p = .70, P(133 < x < 145) c. n = 85, p = .40, P(x > 30) d. n = 150, p = .38, P(x < 62)Post your question