Simple Probability and Its Complement(7.6E)

Front

What is probability?

Back

The chance of an event happening, represented as a fraction of favorable outcomes over total possible outcomes.

Front

How do you calculate the probability of an event?

Back

Probability = Favorable Outcomes / Total Possible Outcomes.

Front

What is a favorable outcome in probability?

Back

An outcome that is considered a success for the event being measured.

Front

What is the total number of outcomes?

Back

The total number of all possible outcomes in a probability experiment.

Front

What is the probability of choosing a yellow marble from a jar with 6 blue, 2 red, and 4 yellow marbles?

Back

P = 4/10 or P = 2/5.

Front

What is the complement of an event?

Back

The probability of an event NOT happening.

Front

If the probability of rain tomorrow is 0.3, what is the probability that it will not rain?

Back

P(not rain) = 1 - P(rain) = 1 - 0.3 = 0.7.

Front

What is the probability of spinning a purple on a spinner with 3 equal sections: red, blue, and purple?

Back

P(purple) = 1/3.

Front

If Lisa can choose from chocolate, vanilla, strawberry, or chocolate chip ice cream, what is the probability she will choose strawberry or chocolate chip?

Back

P(strawberry or chocolate chip) = 2/4 = 1/2.

Front

What does it mean if an event is certain?

Back

The probability of the event is 1.