Let X and Y denote two discrete random variables taking the values in x and y respectively. The collected data over time is represented in the following stochastic model: ?(? = ?, ? = ?) = ?(?, ?). a) Check that this table describes a valid joint probability mass function. b) Find the marginal probabilities of ?? (3)??? ??(2). c) Find following the probability: (i) ?(? = 2, ? = 2), (ii) ?(? = 2 | ? = 2) , (iii) ?(? ≤ 3) d) Find the mean of X. e) Are the X and Y independent? Explain. Note: Kindly assess the table in the picture attached for more information.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.CR: Chapter 13 Review
Problem 29CR
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Question 1: Let X and Y denote two discrete random variables taking the values in x and y respectively. The collected data over time is represented in the following stochastic model: ?(? = ?, ? = ?) = ?(?, ?).

a) Check that this table describes a valid joint probability mass function.

b) Find the marginal probabilities of ?? (3)??? ??(2).

c) Find following the probability: (i) ?(? = 2, ? = 2), (ii) ?(? = 2 | ? = 2) , (iii) ?(? ≤ 3)

d) Find the mean of X.

e) Are the X and Y independent? Explain.

Note: Kindly assess the table in the picture attached for more information.

P(X = x,Y = y) = f(x,y)
y
1
3
fx(0) = 0
0.10 0.05
0.05 0.10
0.04 0.01
0.15 0.15 fx(3) =?
0.05 0.25
2
3
0.5
4
| fy(2) =?
a) Check that this table describes a valid joint probability mass function.
b) Find the marginal probabilities of fx(3)and fy (2).
c) Find following the probability: (i) P(X = 2,Y = 2), (ii) P(X = 2 | Y = 2) , (ii) P(X < 3)
d) Find the mean of X.
e) Are the X and Y independent? Explain.
Transcribed Image Text:P(X = x,Y = y) = f(x,y) y 1 3 fx(0) = 0 0.10 0.05 0.05 0.10 0.04 0.01 0.15 0.15 fx(3) =? 0.05 0.25 2 3 0.5 4 | fy(2) =? a) Check that this table describes a valid joint probability mass function. b) Find the marginal probabilities of fx(3)and fy (2). c) Find following the probability: (i) P(X = 2,Y = 2), (ii) P(X = 2 | Y = 2) , (ii) P(X < 3) d) Find the mean of X. e) Are the X and Y independent? Explain.
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ISBN:
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Publisher:
Pearson Addison Wesley,