# Probability Questions

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1.

During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, and 13 people. Use this information to determine the empirical probability that the next call will be answered in person.

2.

If you roll a die many times, what would you expect to be the relative frequency of rolling a number less than 6?

A) 2 out of 3 B) 1 out of 3 C) 1 out of 6 D) 1 out of 2 E) 5 out of 6

3.

A jar contains 5 yellow marbles, 16 green marbles, and 8 black marbles. If one marble is selected at random, what is the probability that it is not green?

4.

One card is selected at random from a standard 52-card deck of playing cards. Find the probability that the card selected is a red king.

5.

The odds against Thunderbolt winning the Sarasota Derby are 9: 2. Find the probability that Thunderbolt wins.

A) 9/20 B) 11/20 C) 9/11 D) 2/11 E) 2/9

6.

1000 tickets for prizes are sold for $2 each. Seven prizes will be awarded - one for $400, one for $200, and five for $50. Steven purchases one of the tickets.

a) Find the expected value

b) Find the fair price of the ticket.

7.

Two balls are to be selected without replacement from a bag containing one red, one blue, one green, one yellow, and one black ball. How many points are there in the sample space?

8.

A license plate is to consist of two letters followed by three digits. How many different license plates are possible if the first letter must be a vowel, and repetition of letters is not permitted, but repetition of digits is permitted?

9.

A man has 8 pairs of pants, 5 shirts, and 3 ties. How many different outfits can he wear?

10.

A specific brand of bike comes in two frames, for males or females. Each frame comes in a choice of two colors, red and blue, and with a choice of three seats, soft, medium, and hard.

a) Use the counting principle to determine the number of different arrangements of bicycles that are possible.

b) Construct a tree diagram illustrating all the different arrangements of bicycles that are possible.

c) List the sample space.

11.

The results of a survey for an airline are shown below

Traveler Male Female Total

Business 57 92 149

Vacation 72 74 146

Total 129 166 295

Use the chart to find the probability that the traveler was

a) male

b) on vacation given the traveler was male

c) female given the traveler was on business

12.

In how many ways can 7 instructors be assigned to seven sections of a course in mathematics?

13.

At an annual flower show, 6 different entries are to be arranged in a row.

a) How many different arrangements of the entries are possible?

b) If the owners of the 1st, 2nd, and 3rd place entries will be awarded prizes of $100, $50, and $25 respectively, how many ways can the prizes be awarded?

14.

How many different ways are there for an admissions officer to select a group of 7 college candidates from a group of 19 applicants for an interview?

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Mixed Questions 5(b)

For most of these questions, you calculate the probability of something by dividing the number of times that that event occurs by the total number of times you're looking at (For example, look at questions 1, 3, and 4).

1.

During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, and 13 people. Use this information to determine the empirical probability that the next call will be answered in person.

Out of 20 total calls, 13 were answered by people. That means the chance of the phone being answered by a person is 13/20 = 0.65 = 65%.

The probability is 65%.

2.

If you roll a die many times, what would you expect to be the relative frequency of rolling a number less than 6?

A) 2 out of 3 B) 1 out of 3 C) 1 out of 6 D) 1 out of 2 E) 5 out of 6

The probability of rolling a 1, 2, 3, 4, 5, or 6 is equally likely. That means there is a 1 out of 6 chance of rolling a 6, and a 5 out of 6 chance of rolling something else.

The frequency is 5 out of 6.

3.

A jar contains 5 yellow marbles, 16 green marbles, and 8 black marbles. If one marble is selected at random, what is the probability that it is not green?

There are 5 + 16 + 8 = 29 total marbles, and 5 + 8 = 13 non-green ones. The probability that a non-green marble is selected is 13/29 = 0.44828 = 44.8%.

The probability is 44.8%.

4.

One card is selected at random from a standard 52-card deck of playing cards. Find the probability that the card selected is a red king.

There are 2 red kings. The probability that a red king is selected is 2/52 = 0.03486 = 3.5%.

The probability is 3.5%

5.

The odds against Thunderbolt winning the Sarasota Derby are 9: ...

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