The max light rail in portland, or has a waiting time that is normally distributed with a mean waiting time of 5 minutes with a standard deviation of 2.9 minutes. a random sample of 40 wait times was selected, what is the probability the sample mean wait time is under 4 minutes? round answer to 4 decimal places.

Angela took a general public aptitude test and scored in the 88th percentile for aptitude in accounting. what percentage of the scores were at or below her score?

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?