Customers make purchases at a convenience store, on average, every eight and half minutes. It is fair to assume that the time between customer purchases is exponentially distributed. Jack operates the cash register at this store. Required:
a. What is the rate parameter?
b. What is the standard deviation of this distribution?
c. What is the probability that a customer will show up in less than five minutes?
d. What is the probability that nobody shows up for over half an hour?

34 cup. a serving of vegetable soup is 23 cup. the restaurant sold 20 servings of chicken noodle soup and 18 servings of vegetable soup. how many more cups of chicken noodle soup did they sell than cups of vegetable soup?

Average acceleration: i have no idea how to do this.

Which description is represented by a discrete graph? kiley bought a platter for $19 and several matching bowls that were $8 each. what is the total cost before tax? the temperature at 9 a.m. was 83° f and is heating up at an average rate of 6°f per hour. what is the temperature x hours later? juan ate an egg with 78 calories and some cereal with 110 calories per serving for breakfast. what is the total amount of calories he consumed? a bottle contained 2,000 ml of liquid and is being poured out at an average rate of 300 ml per second. how much liquid is left in the bottle after x seconds?