Probability -Part 2

How do you find an event's probability?

• Do the number of favorable outcomes divided by the number of possible outcomes
• Do the number of possible outcomes divided by the number of favorable outcomes
• Find how many outcomes are NOT favorable and divide by the number of possible outcomes
• Find how many outcomes are possible and divide by the number of NOT favorable outcomes

There are three types of cookies in a jar, chocolate chip, peanut butter, and sugar. The probability of chocolate chip is 1/2, and peanut butter is 1/8. What is the probability of a sugar cookie?

• 5/8
• 3/8
• 7/8
• 1/4

What is the difference between theoretical and experimental probability?

• Experimental is based on what SHOULD happen, but theoretical is based on what ACTUALLY happened.
• Theoretical  is based on what SHOULD happen, but experimental is based on what ACTUALLY happened.

Greg planted 50 bean plants and found that 33 grew. He determined that the probability of a bean plant growing is 33/50. Is this an experimental or theoretical probability?

• Theoretical
• Experimental

Probability is the number of possible outcomes divided by the favorable outcomes. True or False?

• True--This gives us the fraction, decimal, or percent answer we want
• False--Probability is the number of favorable outcomes divided by the possible outcomes

The tree diagram shows the outcomes of rolling a die and flipping a coin.  
What is the probability of rolling an even number and flipping a head?

• ³/₁₂
• ¹/₂
• ⁴/₁₂
• ⁰/₁₂

A bag has 3 red marbles, 2 blue and 4 yellow. What is the theoretical probability of pulling a red?

• 3/10
• 3/9
• 1/9
• 1/3

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Amelia receives a treat bag. The treat bag contains 10 gumballs, 5 pixie sticks, 2 bracelets, and 3 chocolates. If Amelia selects 3 items from her treat bag without looking and gives them to her sister, which could NOT represent a possible outcome for the items Amelia selects?

• gumball, gumball, gumball

• pixie stick, gumball, chocolate

• bracelet, bracelet, bracelet

• gumball, gumball, pixie stick

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Use the tree diagram to find the probability of tossing a head first and then a tail when a coin is tossed twice.

• 1

• 1/2

• 1/4

• 1/3

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Based on the chart, what is the probability of pulling a green marble?

• 1/8
• 8/25
• 8/100
• 7/8

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