Monday
December 22, 2014

Homework Help: Stats

Posted by Stephanie F on Tuesday, December 13, 2011 at 3:45pm.

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 and 900 hours?
a. 95 percent
` b. 68 percent
c. 34 percent
d. 99.7 percent
e. cannot be determined from the information given.

also please explain how you get the answer...

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

statistics - A new extended-life light bulb has an average service life of 750 ...
math - 1) A light bulb producing company states that its lights will last an ...
statitics - a light bulb manufacture gaurentees that the mean life of a certain ...
statisitics - A company installs 5000 light bulbs, each with an average life of ...
Statistics - An industrial engineer has found that the standard household light ...
Statistics - An electrical firm which manufactures a certain type of bulb wants ...
sTATISTICS - If light bulbs have lives that are normally distributed with a mean...
statistics, help - Can someone help me which way can I approach this problem. A ...
economics - i have some questions please help Transportation equipment that was ...
stats - If light bulbs have lives that are normally distributed with a mean of ...

Search
Members