Applied Finite Mathematics by Rupinder Sekhon, UniqU, LLC - HTML preview

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Chapter 14Probability: Homework

SAMPLE SPACES AND PROBABILITY

In problems 1 - 6, write a sample space for the given experiment.

A die is rolled.

(14.1){1,2,3,4,5,6}
Exercise 2.

A penny and a nickel are tossed.

A die is rolled, and a coin is tossed.

(14.2){1H,2H,3H,4H,5H,6H,1T,2T,3T,4T,5T,6T}
Exercise 4.

Three coins are tossed.

Two dice are rolled.

Table 14.1.
 123456
1(1, 1)(1, 2)(1, 3)(1, 4)(1, 5)(1, 6)
2(2, 1)(2, 2)(2, 3)(2, 4)(2, 5)(2, 6)
3(3, 1)(3, 2)(3, 3)(3, 4)(3, 5)(3, 6)
4(4, 1)(4, 2)(4, 3)(4, 4)(4, 5)(4, 6)
5(5, 1)(5, 2)(5, 3)(5, 4)(5, 5)(5, 6)
6(6, 1)(6, 2)(6, 3)(6, 4)(6, 5)(6, 6)
Exercise 6.

A jar contains four marbles numbered 1, 2, 3, and 4. Two marbles are drawn.

In problems 7 - 12, a card is selected from a deck. Find the following probabilities.

(14.3)P(an ace)
(14.4)4/52
Exercise 8.
(14.5)P(a red card)
(14.6)P(a club)
(14.7)13/52
Exercise 10.
(14.8)P(a face card)
(14.9)P(a jack or spade)
(14.10)16/52
Exercise 12.
(14.11)P(a jack and a spade)

A jar contains 6 red, 7 white, and 7 blue marbles. If a marble is chosen at random, find the following probabilities.

(14.12)P(red)
(14.13)6/20
Exercise 14.
(14.14)P(white)
(14.15)P(red or blue)
(14.16)13/20
Exercise 16.
(14.17)P(red and blue)

Consider a family of three children. Find the following probabilities.

(14.18)P(two boys and a girl)
(14.19)3/8
Exercise 18.
(14.20)P(at least one boy)
(14.21)P(children of both sexes)
(14.22)6/8
Exercise 20.
(14.23)P(at most one girl)

Two dice are rolled. Find the following probabilities.

(14.24)P(the sum of the dice is 5)
(14.25)4/36
Exercise 22.
(14.26)P(the sum of the dice is 8)
(14.27)P(the sum is 3 or 6)
(14.28)7/36
Exercise 24.
(14.29)P(the sum is more than 10)

A jar contains four marbles numbered 1, 2, 3, and 4. If two marbles are drawn, find the following probabilities.

(14.30)P(the sum of the number is 5)
(14.31)4/12
Exercise 26.
(14.32)P(the sum of the numbers is odd)
(14.33)P(the sum of the numbers is 9)
0
Exercise 28.
(14.34)P(one of the numbers is 3)

MUTUALLY EXCLUSIVE EVENTS AND THE ADDITION RULE

Determine whether the following pair of events are mutually exclusive.

(14.35)A={A person earns more than $25,000}
(14.36)B={A person earns less than $20,000}
Yes
Exercise 30.

A card is drawn from a deck.

(14.37)C={It is a King}D={It is a heart}.

A die is rolled.

(14.38)E={An even number shows}
(14.39)F={A number greater than 3 shows}
No
Exercise 32.

Two dice are rolled.

(14.40)G={The sum of dice is 8}
(14.41)H={One die shows a 6}

Three coins are tossed.

(14.42)I={Two heads come up}
(14.43)J={At least one tail comes up}
No
Exercise 34.

A family has three children.

(14.44)K={First born is a boy}
(14.45)L={The family has children of both sexes}

Use the addition rule to find the following probabilities.

A card is drawn from a deck, and the events C and D are as follows:

(14.46)C={It is a king}
(14.47)D={It is a heart}

Find P(C  or   D).

(14.48)16/52
Exercise 36.

A die is rolled, and the events E and F are as follows:

(14.49)E={An even number shows}
(14.50)F={A number greater than 3 shows}

Find P(E   or   F).

Two dice are rolled, and the events G and H are as follows:

(14.51)G={The sum of dice is 8}
(14.52)H={Exactly one die shows a 6}

Find P(G  or   <