Unit #4 Test Probability 7th Grade - Gibson/Gregg

Front

What is probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 and 1.

Front

What is theoretical probability?

Back

Theoretical probability is the probability of an event based on the possible outcomes in a perfect world. It is what should happen.

Front

What is experimental probability?

Back

Experimental probability is the probability of an event based on the results of an experiment or actual trials.

Front

How do you calculate the probability of an event?

Back

Probability = (Number of favorable outcomes) / (Total number of possible outcomes).

Front

If a coin is flipped, what is the probability of getting tails?

Back

The probability of getting tails when flipping a coin is 1/2.

Front

In a bag of 25 marbles, 5 are red. What is the probability of picking a red marble?

Back

Probability = 5/25 = 1/5.

Front

What is the probability of rolling a 4 on a number cube (die)?

Back

The probability of rolling a 4 is 1/6.

Front

If you roll a die 60 times and get a 4, 10 times, what is the experimental probability of rolling a 4?

Back

Experimental probability = 10/60 = 1/6.

Front

What is the expected number of defects in 500 cell phones if 2 out of 25 are defective?

Back

Expected defects = (2/25) * 500 = 40.

Front

What does it mean if an event has a probability of 0?

Back

A probability of 0 means that the event will not occur.