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1.) It takes the average mechanic 24 minutes to change the oil in 3 cars. If the

ID: 3065660 • Letter: 1

Question

1.) It takes the average mechanic 24 minutes to change the oil in 3 cars. If the time it takes a mechanic to change the oil in a car is exponentially distributed, what is the value of ?

24 minutes
8 minutes per car
72 car minutes
1/8 car per minute
3 cars

2.) Which of the following random variables would have an exponential distribution?

The number of patients out of 40 with type O blood

3.) Fidelity has 175 different no-load mutual funds for investors to purchase. If each fund is given a number from one to one hundred seventy-five, use the random numbers listed below to pick out a simple random sample of 3 funds. (Be sure to start with the first number in the list and read across! The spaces have been included only to help you keep track of where you are.)

521326 170962 092648 697170 694791
304196 804620 876624 856358 730015
420501 447422 089085 498729 304835
242698 782581 658302 263714 514808...

The number of blood draws performed by a lab technician in one day.

Explanation / Answer

1. The value of lambda = 3/24 = 1/8 car per minute

2. The number of patients until you find one with type O blood

The number of a lab technician has between blood draws

3. 170, 092, 170

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