Homework Help: statistics

Posted by Sarah on Tuesday, November 1, 2011 at 3:37pm.

The time necessary to assemble a discount store display is normally distributed with μ = 5 minutes and σ = 30 seconds. A large number of potential employees are timed assembling a practice display. How much time (in minutes) should the personnel manager allow the potential employees to assemble the display if the store wants only 80% of the people to complete the task?

a.4.86
b.5.0
c.5.42
d.5.89

statistics - PsyDAG, Wednesday, November 2, 2011 at 11:38pm
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.8) in the largest portion and use the Z score to calculate the raw time (score). Don't forget to change to common units.

Answer this Question

Related Questions

statistic - The time necessary to assemble a discount store display is normally ...
statistics - the times required to assemble a product part are normally ...
Statistics! - Many companies "grade on a bell curve" to compare the ...
Statistics - Suppose that you have a normally distributed population with ...
statistics - A population of scores is normally distributed with a μ = ...
statistics - Hello!! A survey indicates that for each trip to the supermarket, a...
statistics - The mean (μ) of the scale is 98 and the standard deviation...
STAT - Electricalc has determined that the assembly time for a particular ...
Stor - Here is a simple way to create a random variable X that has mean &#...
statistics - Suppose that the certain lifetimes of a certain light bulb are ...

For Further Reading

First Name:
School Subject:
Answer: