This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The time between arrivals of customers at the drive-up window of a bank follows an exponential ... (Read 91 times)

mwit1967

  • Hero Member
  • *****
  • Posts: 501
on: Jun 24, 2018
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes.
 a. What is the probability that the arrival time between customers will be 7 minutes or less?
  b. What is the probability that the arrival time between customers will be between 3 and 7 minutes?

Question 2

A researcher is interested in determining the average number of years employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample should be selected so that at 95 confidence the margin of error will be 2 months or less?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

janieazgirl

  • Sr. Member
  • ****
  • Posts: 300
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. .5034
b. .2442

Answer to Question 2

48


mwit1967

  • Member
  • Posts: 501
Reply 2 on: Jun 24, 2018
Thanks for the timely response, appreciate it

bblaney

  • Member
  • Posts: 323
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Time Estimates for Specific Office Procedures Cont. Time Estimates for Specific Office Procedures Cont.
Two types of front-engine, front-wheel drive. Two types of front-engine, front-wheel drive.
Time course of HIV infection. Time course of HIV infection.
How to solve an exponential growth problem involving bacterial growth (Question 2) How to solve an exponential growth problem involving bacterial growth (Question 2)
Surtsey, a volcanic island, during the time of its formation. Surtsey, a volcanic island, during the time of its formation.
Video: Replication of DNA and Chromosomes/ How do cells replicate their DNA? (Animation) no Audio

For a complete list of videos, visit our video library