Monday
April 21, 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 ...
Physics - A special kind of light bulb emits monochromatic light of wavelength ...
physics - You are in the lab with a 10 V battery. You have a 10 W light bulb and...
college physics - You are in the lab with a 10 V battery. You have a 10 W light ...
college - a light bulb manufacture claims that the mean life of a certain type ...
statitics - a light bulb manufacture gaurentees that the mean life of a certain ...
statistics - Write the null and alternative hypotheses. Justify which is the ...
physics - A light bulb is wired in series with a 133-Ω resistor, and they ...
Introduction to Electricity and Circuits - A light bulb is wired in series with ...

Search
Members