Simple Probability

An event has a 100% chance of happening. This event is ___.

• Impossible

• Unlikely

• As likely as not

• Likely

• Certain

When figuring the probability of an event, what number goes on top of your fraction?

• The number of the desired event

• The total number of choices possible

• The event that happens most

• The event that happens least

When figuring the probability of an event, what number goes on bottom of your fraction?

• The number of the desired event

• The total number of choices possible

• The event that happens most

• The event that happens least

A spinner has 4 sections: 1 red, 1 blue, 1 green, 1 yellow. What is the probability that you spin and land on blue?

• 1/2

• 1/4

• 2/4

• 3/4

A bag has 7 marbles: 2 green, 2 blue, and 3 orange. What is the probability of reaching in and NOT pulling out a green?

• 2/7

• 3/7

• 4/7

• 5/7

You pick a marble from this bag.

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

• 3/5

• 9/100

• 1/10

• 2/5

The probability that it will snow on Christmas Eve is 1/7. What is the probability that it will NOT snow on Christmas Eve?

• 1/7

• 6/7

• 100%

• 0%

What is the probability of spinning an even number? 

• 16 2/3%

• 33 1/3%

• 50%

• 75%

Determine whether the event is impossible, unlikely, equally likely, likely, or certain. You flip a fair coin and the coin will land heads up.

• impossible

• unlikely

• as likely as not

• likely

Probability can be between what two numbers?

• 10 and 20

• 0 and 100

• 0 and 1

• All Numbers are possible