An information source generates symbols at random from a four-letter alphabet {a,b,c,d} with probabilities P(a) = 1/2, P(b) = 1/4, P(c) = P(d) = 1/8. A coding scheme encodes these symbols into binary codes as follows: a b 10 110 d. 111 Let X be the random variable denoting the lenght of the code, that is the number of binary symbols. Assuming that the generations of symbols are independent, please find E(X²) =? O a. 11/16 O b. 2 Oc. 9/4 O d. 7/4 е. 15/4

An information source generates symbols at random from a four-letter alphabet {a,b,c,d} with probabilities P(a) = 1/2, P(b) = 1/4, P(c) = P(d) = 1/8. A coding scheme encodes these symbols into binary codes as follows: a b 10 110 d. 111 Let X be the random variable denoting the lenght of the code, that is the number of binary symbols. Assuming that the generations of symbols are independent, please find E(X²) =? O a. 11/16 O b. 2 Oc. 9/4 O d. 7/4 е. 15/4

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Description: An information source generates symbols at random from a four-letter alphabet {a,b,c,d} withprobabilities P(a) = 1/2, P(b) = 1/4, P(c) = P(d) = 1/8. A coding scheme encodes thesesymbols into binary codes as follows:ab10110d111Let X be the random var

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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Concept explainers

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.

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Question

An information source generates symbols at random from a four-letter alphabet {a,b,c,d} with
probabilities P(a) = 1/2, P(b) = 1/4, P(c) = P(d) = 1/8. A coding scheme encodes these
symbols into binary codes as follows:
a
b
10
110
d
111
Let X be the random variable denoting the lenght of the code, that is the number of binary
symbols. Assuming that the generations of symbols are independent, please find E(X2) =?
O a. 11/16
O b. 2
O c. 9/4
O d. 7/4
е. 15/4

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