X P(X) 0 0.4 7 0.4 9 0.2 Find the expected value of the above random variable. help me?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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X P(X)
0 0.4
7 0.4
9 0.2



Find the expected value of the above random variable.

help me?

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X P(X)
0 0.4
7 0.4
9 0.2
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