Probability Test Review

Probability values must be between ...

• 0 and 1

• -1 and 1

• 0 and .5

• -.5 and .5

__________ are done with replacement

• Independent events

• Dependent events

• Disjoint events

• Events that are NOT disjoint

__________ are done without replacement

• Independent events

• Dependent events

• Disjoint events

• Events that are NOT disjoint

__________ are events that can't be true at the same time

• Independent events

• Dependent events

• Disjoint events

• Events that are NOT disjoint

__________ are events that can be true at the same time

• Independent events

• Dependent events

• Disjoint events

• Events that are NOT disjoint

An easier way to write P(at least 1) is ________. Otherwise you would need to add up P(1)+P(2)+P(3)+P(4)...

• 1-P(0)

• 1-P(1)

• P(1')

Check to see whether the probability model is legitimate. Explain what you checked.

• Yes, the probabilities are all between 0 and 1, and add to 1.

• No, the probabilities aren't all between 0 and 1

• No, the probabilities don't add to 1

• No, they aren't percents.

What is the probability that a randomly chosen household will have a total income less than $100,000?

• .728

• .272

• .878

• .179

What is the probability that a randomly chosen household will have a total income of at least $75,000?

• .451

• .179

• .272

• .549

The clown at the local fair has 12 red balloons and 6 blue balloons. What is the probability that Mirelle and Kailey get the same color balloon?

• (12/18)(11/17)=0.4313

• (12/18)(11/17)+(6/18)(5/17)=0.5303

• (6/18)(5/17)=0.0980

• (12/18)(12/18)+(6/18)(6/18)=0.5556