An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to 800 hours and a standard deviation of 40 hours. A.  Find the expected number of light bulbs which have a length of life between 680 to 720 hours if the firm manufactures 3000 light bulbs for the month. 65 94 102 78 B.  Find the expected number of light bulbs which have a length of life between 800 to 840 hours if the firm manufactures 3000 light bulbs for the month. 358 1357 1024 874 C.  Which of the following does not describe a characteristics of a normal probability distribution? The area under a normal curve is 1 or 10% There is perfect symmetry about the central value of the normal curve. The width of a normal curve is determined by the standard deviation. The normal curve is bell-shaped.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Question

ASAP

An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to 800 hours and a standard deviation of 40 hours.

A.  Find the expected number of light bulbs which have a length of life between 680 to 720 hours if the firm manufactures 3000 light bulbs for the month.

65

94

102

78

B. 

Find the expected number of light bulbs which have a length of life between 800 to 840 hours if the firm manufactures 3000 light bulbs for the month.

358

1357

1024

874

C. 

Which of the following does not describe a characteristics of a normal probability distribution?

The area under a normal curve is 1 or 10%

There is perfect symmetry about the central value of the normal curve.

The width of a normal curve is determined by the standard deviation.

The normal curve is bell-shaped.

Expert Solution
steps

Step by step

Solved in 4 steps with 4 images

Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman