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

Author Question: The average time taken to complete an exam, X, follows a normal probability distribution with mean = ... (Read 31 times)

plus1

  • Hero Member
  • *****
  • Posts: 676
on: Jul 24, 2018
The average time taken to complete an exam, X, follows a normal probability distribution with mean = 60 minutes and standard deviation 30 minutes. By what time should 99 of the students have finished the exam? (i.e. What is the 99th percentile for X?)
 a. 85.2 minutes
  b. 89.4 minutes
  c. 129.9 minutes
  d. 150.0 minutes

Question 2

A randomly selected sample of 30 students spent an average amount of 40.00 on a date, with a standard deviation of 5.00 . The standard error of the sample mean is
 a. 0.063
  b. 0.167
  c. 0.913
  d. 5.000


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

stano32

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jul 24, 2018
Answer to Question 1

C

Answer to Question 2

C


plus1

  • Member
  • Posts: 676
Reply 2 on: Jul 24, 2018
:D TYSM

kjohnson

  • Member
  • Posts: 330
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Menstrual cycle summary based on a 28-day (average) menstrual cycle. Menstrual cycle summary based on a 28-day (average) menstrual cycle.
Pericardial effusion: A, normal pericardial sac; B, pericardial sac with excess fluid possibly causi Pericardial effusion: A, normal pericardial sac; B, pericardial sac with excess fluid possibly causi
bimanual exam bimanual exam
Physics: Power, Energy and Time Physics: Power, Energy and Time
An endoscopic view of the colon of someone who carries the normal alleles for the APC gene An endoscopic view of the colon of someone who carries the normal alleles for the APC gene
Polar distribution of auxin is driven by asymmetrical positioning of plasma membrane active transpor Polar distribution of auxin is driven by asymmetrical positioning of plasma membrane active transpor
Video: Phases of the Female Reproductive Cycle - Hormonal regulation

For a complete list of videos, visit our video library