The speeds on the interstate are normally distributed with a mean of 70 mph and a standard deviation of 5 mph. approximately what percent of speeds fall between 60 mph and 80 mph?

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge