Free Printable Probability Rules

Worksheets

Probability Rules

Total questions: 10

Worksheet time: 28mins

Name

Class

Date

Two events A and B are (a) if they have no outcomes in common and so can never occur together.

You flip a nickel three times.

Find the probability that all flips will land on tails.

P(tails, tails, tails)=

1/2

1/4

1/6

1/8

Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

No, all probabilities are not be between 0 and 1 inclusive

No, the sum of all the probabilities is not 1.

Yes, because the distribution is symmetric

A jar contains 4 white chips, 5 purple chips, and 1 black chip. Chips are selected randomly one at a time, and are not replaced.
What is P(purple then black)?

1/18

2/5

3/7

4/9

If you draw one card from a standard deck, what is the probability of drawing a 5 or a diamond?

2/52

4/52

16/52

26/52

On December 17, 2020, Gallup polling found that 31% of Americans identified as Democrats, 25% identified as Republican, and 41% as Independent. The rest of those polled did not identify with a political party.

What percent did not identify with a political party?

a) 3%

b) 4%

c) 7%

d) 6%

You pick a marble from this bag.

What is the probability you will choose either a black or white marble?

P(black or white)=

3/5

9/100

1/10

2/5

Dice have six faces, showing 1 to 6 pips (spots). If a die is balanced, all six faces are equally likely. What must be the probability of each face?

1/10, or 0.10.

1/6, or 0.167.

2/10, or 0.20.

could be any number between 0 and 1.

The outcomes for rolling two number cubes numbered 1 through 6 are shown above. What is the probability the sum of the number cubes will be 7 or 4?

$\frac{1}{12}$

$\frac{1}{6}$

$\frac{1}{4}$

$\frac{11}{36}$

10.

Which Rule Should you use for the following scenario:

Event A has a 9/10 chance of occurring. Event B may also occur. TO find the probability of Event A and Event B happening, what rule should I use?

Multiplication Rule

Complement Rule

Addition Rule for ME events

Addition Rule for Non-ME events

100 %

Probability Rules

Total questions: 10

Worksheet time: 28mins

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