Understanding Probability

Understanding Probability

What is probability? How do I calculate it?

Multiple Choice

An unlikely chance event is closer to what number?

• 0

• 1

• 2

• 3

Multiple Choice

A likely chance event is closer to what number?

• 0
• 1
• .5
• 100

Multiple Choice

Ben has two marbles of the same size in his pocket, a green one and a red one. He puts his hand into his pocket and, without looking, takes out a red marble.

• impossible

• unlikely

• even chance

• likely

• certain

Multiple Choice

Two percent of the valves in new soccer balls are defective. You buy a ball with a good valve.

• certain

• likely

• even chance

• unlikely

• impossible

Multiple Choice

You will turn 2 years old on your next birthday.

• certain

• likely

• even chance

• unlikely

• impossible

Multiple Choice

A light bulb which is expected to last for 300 hours blows after 2 hours.

• certain

• likely

• even chance

• unlikely

• impossible

Multiple Choice

GYPSY is to travel or roam from place to place. What is the likelihood of getting a consonant letter in the word, GYPSY?

• certain

• likely

• even chance

• unlikely

• impossible

Multiple Choice

A slice of bread with butter and jam spread on one side is dropped on the floor. It lands with the jam side facing up.

• impossible

• unlikely

• even chance

• likely

• certain

Multiple Choice

Nosipho has ten marbles of the same size in her pocket, 6 white and 4 red marbles. She takes out a white marble when she puts her hand in her pocket without looking.

• impossible

• unlikely

• even chance

• likely

• certain

Multiple Choice

Leroy has six red marbles of the same size in his pocket. He puts his hand into his pocket and, without looking, takes out a blue marble.

• impossible

• unlikely

• even chance

• likely

• certain

Multiple Choice

Cindy has three marbles of the same size in her pocket, a green, a blue and a red marble. She puts her hand into her pocket and, without looking, takes out a red marble.

• impossible

• unlikely

• even chance

• likely

• certain

Multiple Choice

What is the probability of spinning a shade of blue?

• 1/5
• 2/5
• 3/5
• 4/6

Multiple Choice

Theoretically, what is the probability of rolling a sum of one with a pair of dice?

• 0
• 1/6
• 1/12
• 1/36

Multiple Choice

What is the probability of selecting an orange candy?

• 0%

• 25%

• 50%

• 100%

Multiple Choice

What is the probability of spinning a yellow, green, or blue?

• 3/4

• 1/12

• 1/3

• 1/16

Multiple Choice

What is the probability of spinning a red or spinning a yellow?

• 1/8

• 1/16

• 1/2

• 1/3

Multiple Choice

What is the probability of spinning a number less than 2 ?

• 3/10

• 3/5

• 1/25

• 1/5

Multiple Choice

What is the probability of spinning a number less than 5? 

• 16 2/3%
• 33 1/3 %
• 66 2/3%
• 83 1/3%

Multiple Choice

Probability of:

Spinning a 5 and

Drawing an C

• 0 - there isn't a 5

• 1/4

• 1/8

• 1/16

Multiple Choice

The letters that form the word MATHEMATICS are placed in a bowl. What is the probability of choosing a "M"?

• 8/121

• 4/11

• 2/11

• 4/121

Multiple Choice

What is the probability of spinning an even number?

• 16 2/3%

• 33 1/3%

• 50%

• 75%

Multiple Choice

The letters that form the word ALGEBRA are placed in a bowl. What is the probability of choosing a letter other than “A”?

• 2/7

• 5/49

• 5/7

• 10/49

Multiple Choice

The following M & M colors are in the bowl:
4 yellow, 6 orange, 3 green, 5 blue, 2 brown
What is the probability of selecting a brown candy?

• 2/18
• 1/9
• 2/20
• 1/10

Multiple Choice

A number is randomly selected from 0-10. What is the probability the number selected is greater than 5?

• 1/2

• 3/5

• 2/5

• 5/11