1 STAT 225, Quiz 5 Fri. March 28, 2014 Name (please print) ________________________ Class Time: _________________ Directions: You have 10 minutes to complete the quiz. Show all work to receive full credit. Instructors will not interpret questions for you. Write out the probability statement and show work. Use 4 decimal places in your answers. An ATM at a busy airport location averages 5 minutes between customers. 1.Give the distribution and parameter(s) of the time between ATM customers. What is the standard deviation of the time between ATM customers? (4 pts)

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2.A customer has just finished using the ATM. What is the probability that it takes more than 7.5 minutes until the next customer arrives? (3 pts.)

3.What is the probability that the next customer to use the ATM, does so within 3 minutes of the last customer? (3 pts.)

4.Given that no one has used the ATM in 2 minutes, what is the probability that it will take between 6 and 7 minutes total for the next customer to arrive? (5 pts.)

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