Homework Help: Statistics

Posted by Karen on Saturday, February 16, 2013 at 8:36pm.

An airline reports that if has been experiencing a 15% rate of no-shows on advanced reservations. Among 150 advanced reservations, find the probability that there will be fewer than 20 no-shows.

Statistics - MathGuru, Monday, February 18, 2013 at 9:03pm
Mean = np = 150 * .15 = ?

Standard deviation = √npq = √(150 * .15 * .85) = ?

Note: q = 1 - p

I'll let you finish the calculations.

Once you have the mean and standard deviation, use z-scores:
z = (x - mean)/sd
Note: x = 20

After you calculate z, check a z-table to find your probability. (Remember that the problem is asking for "fewer than 20" when you check the table.)

I hope this will help get you started.

Answer this Question

Related Questions

Statistics - An airline reports that if has been experiencing a 15% rate of no-...
statistics - : an airline offers discounted advanced purchase fares to customers...
statistics - An airline experiences a no-show rate 6%. What is the maximum ...
Statistics - An airline experiences a no-show rate 6%. What is the maximum ...
statistics - Lilly collects data on a sample of 40 high school students to ...
statistics - Lilly collects data on a sample of 40 high school students to ...
Statistics - 3. A professor is interested in whether there is a difference in ...
statistics - Lilly collects data on a sample of 40 high school students to ...
statistics - Consumer Reports rated airlines and found that 80% of flights ...
Statistics Question - Consumer Reports rated airlines and found that 80% of ...

For Further Reading

First Name:
School Subject:
Answer: