Author Question: On the average, 6.7 cars arrive at the drive-up window of a bank every hour. Define the random ... (Read 100 times)

waynest

  • Hero Member
  • *****
  • Posts: 553
On the average, 6.7 cars arrive at the drive-up window of a bank every hour. Define the random variable x to be the number of cars arriving in any hour.
 a. What is the appropriate probability distribution for x? Explain how x satisfies the properties of the distribution.
  b. Compute the probability that exactly 5 cars will arrive in the next hour.
  c. Compute the probability that no more than 5 cars will arrive in the next hour.

Question 2

The 95 confidence interval estimate of a population variance when a sample variance of 324 is obtained from a sample of 81 items is
 a. 14.14 to 174.94.
  b. 243.086 to 453.520.
  c. 16.42 to 194.35.
  d. 254.419 to 429.203.



af

  • Sr. Member
  • ****
  • Posts: 356
Answer to Question 1

a. Poisson; it shows the probability of x occurrences of the event over a time period.

b. 0.1385
c. 0.3406

Answer to Question 2

b



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

The average adult has about 21 square feet of skin.

For a complete list of videos, visit our video library