8.4-8.5 Probability Practice

What's the probability of spinning a number greater than 2?

• 2/6 = 1/3

• 4/6 = 2/3

• 5/6

• 1/6

Answer explanation

Numbers greater than 2 are: 3, 4, 5, and 6, so there are four out of six that are greater than 2.

Tags

CCSS.7.SP.C.7B

How many times can you expect to spin a 4 if you spin 66 times?

• 4 times

• 17 times

• 11 times

• 14 times

Answer explanation

To make a prediction:

1) Find the probability of the event. P(4)

2) Multiply the probability by the number of trials. P(4) * 66

Tags

CCSS.7.SP.C.6

Theoretical Probability is ____

• the result of our experiment

• the likelihood that something will happen based on knowing all possible outcomes. (what "should" happen)

A bag contains 5 quarters, 2 dimes, and 4 pennies. What is the probability of picking a quarter?

• 5

Answer explanation

There are eleven coins in all. Five of them are quarters.

Tags

CCSS.7.SP.C.7B

What is the probability of pulling a cake pop and it not being pink?

P(not pink)

 

• 4

• 40%

Answer explanation

Four of the six cake pops are NOT pink.

Tags

CCSS.7.SP.C.7B

If you choose from the following M & M colors, what is the probability that you choose blue? **Remember to simplify**

5 green

6 yellow

8 blue

7 brown

Answer explanation

There are 26 M&Ms in all. 8 of them are blue.

*Always simplify your answer.

Tags

CCSS.7.SP.C.7B

Probability can only be values between which two numbers?

• 0 to 20

• 1 to 10

• 0 to 5

• 0 to 1

Answer explanation

A probability of 0 means it is impossible, and a probability of 1 means it is certain to happen.

Tags

CCSS.7.SP.C.5

If an event has a probability of zero, how likely is it to occur?

• impossible

• likely

• certain

• unlikely

Tags

CCSS.7.SP.C.5

Alex flips a fair coin 40 times. How many times can he expect heads to appear?

• 4 times

• 10 times

• 15 times

• 20 times

Answer explanation

To make a prediction:

1) Find the probability of the event. P(heads)

2) Multiply the probability by the number of trials.

P(heads) * 40

Tags

CCSS.7.SP.C.6

A number cube has sides labeled 1 to 6. Hannah rolls the number cube 18 times. How many times can she expect to roll a number less than 3?

• 2 times

• 3 times

• 6 times

• 8 times

Answer explanation

To make a prediction:

1) Find the probability of the event. P(number less than 3)

2) Multiply the probability by the number of trials.

P(number less than 3) * 18

Tags

CCSS.7.SP.C.6