This site is designed solely for the use of Mr. Habib's MAT 120 classes. All rights reserved. No part of this site or its contents from MAT textbook (STATISTICS Informed Decisions Using Data by: Michael Sullivan, III) may be reproduced by any process without written permission by the author or publisher and/or Mr. Habib.
Computing the Mean of a Discrete Random Variable
Example: Compute the mean of the discrete random variable given in the table below.
|
x |
P(X = x) |
|
0 |
0.008 |
|
1 |
0.096 |
|
2 |
0.384 |
|
3 |
0.512 |
Press STAT and select 1:Edit. Clear L1 and L2. Enter the X-values from above table into L1 and the P(X=x) values into L2. Press STAT and highlight CALC. Select 1:1-Var Stats, press ENTER and press 2nd [L1] , 2nd [L2] ENTER to see the descriptive statistics.
.doc_files/image002.jpg)
.doc_files/image004.jpg)
The mean of this discrete random variable is 2.4.