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Given that x is a Hypergeometric random variable with N=10, n=5, and r=6, compute the following:

a. P(X=0)

b. P(x=1)

c. P(X1)

d. P(X2)

Short Answer

Expert verified

a.The Hypergeometric probability PX=0=0with the valuesN=10, n=5, and r=6.

b. The Hypergeometric probabilityPX=1for N=10, n=5, r=6 is 0.02381.

c. TheHypergeometric probabilityPX1 for N=10, n=5, r=6 is 0.02381.

d.The Hypergeometric probabilityPX2 for N=10, n=5, and r=6 is 0.97619.

Step by step solution

01

Given Information

The x is a Hypergeometric random variable with N=10, n=5, and r=6.

02

State the Hypergeometric Probability distribution function.

The Hypergeometric distribution is,

Px=rxN-rn-xNnx=Maximum0,n-N-r,...,Minimumr,n

03

(a) Compute the Probability P(X=0).

The Hypergeometric probability is valid when n-xN-r.

This means that the following condition is satisfied:

0xrand0n-xN-r

i.e.,The Hypergeometric probability is valid when; max0,n-N+rxminr,n.

Here,n-x>N-r5-0>10-6 .

Therefore,

The Hypergeometric probability PX=0=0with the values N=10, n=5, and r=6.

04

Step 4:(b) Compute the probability P(X=1).

The probabilityPX=1 is calculated as:

Px=1=6110-65-1105=6!1!6-1!4!4!4-4!10!5!10-5!=61252=0.02381

Hence, the required Hypergeometric probability PX=1for N=10, n=5, and r=6 is 0.02381.

05

Step 4:(c) Compute the probability P(X⩽1).

The probability Px1is calculated as:

PX1=PX=0+PX=1=6l010-65-0105+6110-65-1105=0+6!1!6-1!4!4!4-4!10!5!10-5!=0+61252=0.02381

Where PX=0=0. Because n-xN-r5-0>10-6.

Hence, the required Hypergeometric probabilityPX1 for N=10, n=5, r=6 is 0.02381.

06

Step 5:(d) Compute the probability P(X⩾2).

The probability PX2is computed as:

PX2=1-PX<2=1-PX=0+PX=1=1-6010-65-005+6110-65-1105=1-0+6!1!6-1!4!4!4-4!10!5!10-5!=1-0+0.02381=0.97619

WherePX=0=0. Because n-xN-r5-0>10-6.

Hence, the required Hypergeometric probability PX2for N=10, n=5, r=6 is 0.97619.

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