Author Question: What is the probability that no one is waiting or being served in the express checkout line? What ... (Read 118 times)

mmm

  • Hero Member
  • *****
  • Posts: 558
What is the probability that no one is waiting or being served in the express checkout line?
 
  What will be an ideal response?

Question 2

You are in charge of arranging the catering for a company meeting. Your company is responsible for paying for all meals ordered, so you don't want to order too many.
 
  Suppose that the expected number of people for the meeting is 84, with a standard deviation of 4 people. What is the fewest number of meals should you order so that the probability of having more people than meals is 5?



scrocafella

  • Sr. Member
  • ****
  • Posts: 346
Answer to Question 1

P(Express line is empty) = P(Y = 0 ) = 0.30

Answer to Question 2

P(X > k) = 0.05  PZ > (k - 84 ) / 4 = 0.05  (k - 84 ) / 4 = 1.645  k = 90.58  91 meals



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

For a complete list of videos, visit our video library