Homework Help: statistics

Posted by Barbara on Sunday, November 21, 2010 at 3:44pm.

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $220.

What is the operating cost for the lowest 5 percent of the airplanes?

statistics - Joe, Sunday, November 21, 2010 at 6:45pm
According to the standard bell curve and the empirical rule, the lowest 5% would be 2 standard deviations below the mean making the operating cost of the lowest 5% of airplanes equal to $1785
statistics correction - PsyDAG, Monday, November 22, 2010 at 8:32am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the Z score related to that proportion.

For the lowest 5%, you need a Z score of -1.645.

Insert the values in the above equation to solve for the score.
statistics - m, Thursday, April 18, 2013 at 9:30pm
.59

Answer this Question

Related Questions

statistics - Among coffee drinkers, men drink a mean of 2.8 cups per day with a ...
Statistics - Which of the following statements are correct? 1.A normal ...
statistics - Which of the following statements are correct? a. a normal ...
Statistics - 1. Which of the following statements are correct? a. A normal ...
statistics - which of the following statements are correct? a. a normal ...
statistics - Which of the following statements are correct? a. A normal ...
MATH - Which of the following normal distributions has the smallest spread? A. A...
Math - Bank XYZ is hiring, and they would like to determine the number of ...
Math - The hourly operating cost of an airplane, which seats up to 405 ...
Math - The hourly operating cost of an airplane, which seats up to 405 ...

For Further Reading

First Name:
School Subject:
Answer: