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Suppose that a die is rolled twice. What are the possible values that the following random variables can take on:

(a) the maximum value to appear in the two rolls;

(b) the minimum value to appear in the two rolls;

(c) the sum of the two rolls;

(d) the value of the first roll minus the value of the second roll?

Short Answer

Expert verified
  1. The maximum value to appear in two rolls are {1,2,3,4,5,6}
  2. The minimum value to appear in the two rolls are {1,2,3,4,5,6}
  3. The sum of the two rolls can be from 2to12
  4. The value of the first roll minus the value of the second roll from-5to5

Step by step solution

01

Step1: Given Information (part a)

Let's consider that a die is rolled twice.

The maximum of two rolls is also remains a random variable.

02

Step2: Explanation (part a)

A die includes the numbers of {1,2,3,4,5,6}. That means there are 36combinations can occur.

Since for every k∈{1,2,3,4,5,6}ordered pair (k,k)can occur.

Therefore, the maximum value appear in the two rolls is{1,2,3,4,5,6}

03

Final Answer 

The maximum value appear in the two rolls is {1,2,3,4,5,6}

04

Step4: Given Information (part b)

Let's consider that a die is rolled twice.

The maximum of two rolls is also remains a random variable.

We have to find the minimum value to appear in the two rolls.

05

Step5: Explanation (part b)

Since,(k,k)can occur in two rolls, Where k∈{1,2,3,4,5,6}.

Therefore, the minimum value to appear in the two rolls are{1,2,3,4,5,6}

06

Final Answer (Part b)

The minimum value to appear in the two rolls; 1,2,3,4,5,6

07

Step7: Given Information (part c)

Let's consider that a die is rolled twice.

The maximum of two rolls is also remains a random variable.

We have to find the sum of two rolls.

08

Step8: Explanation (part c)

Both die can take values from 1to 6. Therefore the smallest sum is 2and the largest sum is 12.It is trivial to see that every number un between can occur.

The possible values are2,3,4,5,6,7,8,9,10,11,12

09

Final Result (part c)

The sum of two rolls are taken from2to12

10

Step10: Given Information (part d)

Let's consider that a die is rolled twice.

The maximum of two rolls is also remains a random variable.

We have to find the value of the first roll minus the value of the second roll.

11

Step11: Explanation (part d)

Possible value for first roll 1,2,3,4,5,6

Possible value for second roll1,2,3,4,5,6

The value of first roll minus second roll

-5,-4,-3,-2,-1,0,1,2,3,4,5


12

Step12: Final Result (part d)

The value of the first roll minus the value of the second roll from-5to5

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