Author Question: During normal business hours at a gas station, customers arrive, on average, every ten minutes. ... (Read 146 times)

abarnes

  • Hero Member
  • *****
  • Posts: 556
During normal business hours at a gas station, customers arrive, on average, every ten minutes. Assume that the distribution of the time between arrivals follows an exponential distribution. Suppose that a customer has just left the gas station.
 
  What is the probability that the cashier at the gas station has more than 15 minutes before the next customer arrive?

Question 2

The total degrees of freedom is:
 
  A) 21
  B) 22
  C) 23
  D) 24



Perkypinki

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

Exponential with mean 1/ = 10, then,  = 0.10, and P(T > 15 ) = e-15 = e-1.5 = 0.223

Answer to Question 2

C



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

Did you know?

The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

Did you know?

Cyanide works by making the human body unable to use oxygen.

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

For a complete list of videos, visit our video library