A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 one year ago
A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. How many bulbs should have a life expectancy between 400 and 600 hours?
 one year ago
A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. How many bulbs should have a life expectancy between 400 and 600 hours?

This Question is Open

kropot72
 one year ago
Best ResponseYou've already chosen the best response.0The empirical rule for a normal distribution tells us that approximately 68% of the data points lie within the range of plus and minus one standard deviation of the mean. In this case the range plus and minus one standard deviation of the mean is between 400 and 600 hours. Therefore the number of bulbs that should have a life expectancy between 400 and 600 hours is 68% of 5000.
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.