Question
Asked Jul 21, 2019
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construct a probability distribution and draw a graph for a family of 3 children.  Let X represent the number of boys. Find the mean, variance, ad standard deviation for the distribution.

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Expert Answer

Step 1

According to the given question, construct a probability distribution and draw a graph for a family of 3 children.  Let X represents the number of boys. Therefore the x can be considering the following sample space:

Sample Space observation

X value

GGG

0

GGB,BGG,GBG

1

GBB,BBG,BGB

2

BBB

3

 

Therefore total possible cases 8 and the corresponding probably (discrete) distribution a for a family of 3 children is as follows:

Number of boys (X)

0

1

2

3

Total

Probability (X)

1/8

3/8

3/8

1/8

1

  

The graph for a family of 3 children is as follows:

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Probability (X) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 3 0 Number of boys (X) -

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Step 2

Mean=1.5, varaince =0.75 and standard deviation=0.866,...

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We know the mean E(X) 1.5 Explanation: E(X)-ΣΧP (X) 3 0x 1x+2x-3x- 8 8 12 8 1.5 Variance Var(X = 0.75 Explanation Var(X) E(x)-E(X) -3-(1.5)2 0.75 enco nco

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