Let X be a random variable with the following probability distribution. Value x of X P(X=x) -20 0.30 -10 0.05 0.10 10 0.25 20 0.05 30 0.25 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E (x) = 4.5 (b) Find the variance Var(X) of X. Var (x) =
Let X be a random variable with the following probability distribution. Value x of X P(X=x) -20 0.30 -10 0.05 0.10 10 0.25 20 0.05 30 0.25 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E (X) of X. E (x) = 4.5 (b) Find the variance Var(X) of X. Var (x) =
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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![Let X be a random variable with the following probability distribution.
Españo
Value x of X
P(X=x)
-20
0.30
-10
0.05
00
0.10
10
0.25
20
0.05
30
0.25
Complete the following. (If necessary, consult a list of formulas.)
(a) Find the expectation E (X) of X.
E (x) = 4.5
(b) Find the variance Var(X) of X.
Var(x) = 0](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4d65af4f-942d-4901-951c-cc2f98d7395f%2F54ab8b67-a66b-445a-874a-da3a326c6bf6%2Fbg4jpt_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Let X be a random variable with the following probability distribution.
Españo
Value x of X
P(X=x)
-20
0.30
-10
0.05
00
0.10
10
0.25
20
0.05
30
0.25
Complete the following. (If necessary, consult a list of formulas.)
(a) Find the expectation E (X) of X.
E (x) = 4.5
(b) Find the variance Var(X) of X.
Var(x) = 0
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