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Two dice are rolled. Let X = 1 if the dice come up doubles

Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi ISBN: 9780073401331 38

Solution for problem 6E Chapter 4.1

Statistics for Engineers and Scientists | 4th Edition

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Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi

Statistics for Engineers and Scientists | 4th Edition

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Problem 6E

Two dice are rolled. Let X = 1 if the dice come up doubles and let X = 0 otherwise. Let Y = 1 if the sum is 6. and let Y=0 otherwise. Let Z = 1 if the dice come up both doubles and with a sum of 6 (that is, double 3), and let Z = 0 otherwise.

a. Let px denote the success probability for X. Find pX

b. Let pY denote the success probability for Y. Find py.

c. Let pz denote the success probability for Z. Find pz.

d. Are X and Y independent?

e. Does pz = PXPY

f. Does Z = XY? Explain.

Step-by-Step Solution:

Answer:

Step 1 of 6:

(a)

In this question, we are asked to find the success probability for  and hence .

Two dice are rolled.

Let if the dice come up doubles and let  otherwise.

Let  if the sum is 6. and let otherwise.

Let  if the dice come up both doubles and with a sum of 6, and let otherwise.

Let is the outcome of rolling the first dice where is the number from to  that die will show.

Let is the outcome of rolling the second dice where is the number from to  that die will show.

Dice are rolled in the pairs , we have  of such pairs.

Since when the dice come up doubles, then the outcomes which contribute success are .

Hence number of outcomes where dice come up doubles  =

Therefore the success probability is

 =

Hence the success probability for () is .

Step 2 of 6:

(b)

In this question, we are asked to find the success probability for and hence .

Since when the sum is 6, then the outcomes which contribute success are .

Hence number of outcomes where the sum is six  =

Therefore the success probability is

 =

Hence the success probability for () is.

Step 3 of 6:

(c)

In this question, we are asked to find the success probability for  and hence .

Since when the dice come up both doubles and with a sum of 6, then the outcomes which contribute success are .

Hence number of outcomes where the dice come up both doubles and with a sum of six  =

Therefore the success probability is

 =

Hence the success probability for () is.

Step 4 of 6

Chapter 4.1, Problem 6E is Solved
Step 5 of 6

Textbook: Statistics for Engineers and Scientists
Edition: 4
Author: William Navidi
ISBN: 9780073401331

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Two dice are rolled. Let X = 1 if the dice come up doubles

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