The distribution of the time until change (in days) of a Web site is approximated in the following table. Days until Changes Probability 1.5 0.05 3.0 0.25 4.5 0.40 5.0 0.20 7.0 0.10 Let the random variable X denote the days until change. Calculate the mean for X. Give exact answer. E(X) = i days Calculate the variance for X. Round your answer to three decimal places (e.g. 98.765).

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
Current Attempt in Progress
The distribution of the time until change (in days) of a Web site is approximated in the following table.
Days until Changes Probability
1.5
0.05
3.0
0.25
4.5
0.40
5.0
0.20
7.0
0.10
Let the random variable X denote the days until change.
Calculate the mean for X. Give exact answer.
E(X) = i
days
Calculate the variance for X. Round your answer to three decimal places (e.g. 98.765).
V(X) = i
days?
Transcribed Image Text:Current Attempt in Progress The distribution of the time until change (in days) of a Web site is approximated in the following table. Days until Changes Probability 1.5 0.05 3.0 0.25 4.5 0.40 5.0 0.20 7.0 0.10 Let the random variable X denote the days until change. Calculate the mean for X. Give exact answer. E(X) = i days Calculate the variance for X. Round your answer to three decimal places (e.g. 98.765). V(X) = i days?
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Similar 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