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STA Class
05:59:47
•
4.3 Expected Values of Discrete Random Variables
o
Mean (expected value): ® = multiplied by
μ = E(x) =
x ® p(x)
∑
o
Variance:
² =
(xμ)² p(x)
σ
∑
² = [ x² p(x)]  μ²
σ
∑
o
Ex. Sickle Cell Problem
The expected number of children in 3 to get sickle cell anemia is:
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Fig 4.31
The variance is
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Fig 4.3 2
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#1 Handout, or 4.33 page 202
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Fig HO#1 – 1
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A. find the mean of x and the mean of y. compare.
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B. find the standard deviation of x and the standard deviation of y.
compare.
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Answers HO#12 a
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HO#13 b
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#2 from Ch 4
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Fig HO#2 1
o
Given that this is a valid probability distribution
A. find the probability that x = 4
Find μ and
σ
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Find the prob. That x is greater than 2
Find the prob. that x equals 1.5
Find the prob that x is at most 6
Find the prob that x will b within 2 SD of µ
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Answers HO#2 – 2
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4.4 the Binomial Random Variable
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Experiments where only 2 possible responses exist (success/failure)
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This note was uploaded on 04/07/2008 for the course STA 2023 taught by Professor Bagwhandee during the Fall '07 term at University of Central Florida.
 Fall '07
 Bagwhandee
 Variance

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