Answer Happy

A study found that highway drivers in one state traveled at an average speed of 63.4 miles per hour (MPH). Assume the population standard deviation is 6.9 MPH. Complete parts a through d below. a. What is the probability that a sample of 30 of the drivers will have a sample mean less than 62 MPH? = P(<62) = (Round to four decimal places as needed.) b. What is the probability that a sample of 40 of the drivers will have a sample mean less than 62 MPH? < = P(x<62) = (Round to four decimal places as needed.) c. What is the probability that a sample of 50 of the drivers will have a sample mean less than 62 MPH? < P(x<62) = (Round to four decimal places as needed.) d. Explain the difference in these probabilities. the population mean of 63.4 As the sample size increases, the standard error of the mean and the sample means MPH. Therefore, the probability of observing a sample mean less than 62 MPH