A random variable X can take only the values 2, -2, and 4. It is known that Pr[X = 2] = 0.3 and Pr[X = -2] = 0.1. What is the expected value of X? %3D (A) 1 (В) 2.2 (C) 3.2 (D) 2.8 (E) 3 (F) -2 (G) 0.4 (H) 0

A random variable X can take only the values 2, -2, and 4. It is known that Pr[X = 2] = 0.3 and Pr[X = -2] = 0.1. What is the expected value of X? %3D (A) 1 (В) 2.2 (C) 3.2 (D) 2.8 (E) 3 (F) -2 (G) 0.4 (H) 0

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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Question

A random variable X can take only the values 2, -2, and 4. It is known that Pr[X = 2] = 0.3
and Pr[X = -2] = 0.1. What is the expected value of X?
(A) 1
(В) 2.2
(C) 3.2
(D) 2.8
(E) 3
(F) -2
(G) 0.4
(H) 0

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