15) HS: Intro to Probability

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1.

Front

What does a probability of 0 mean?

Back

A probability of 0 means that the event cannot happen.

Front

What does a probability of 1 mean?

Back

A probability of 1 means that the event is certain to happen.

Front

How do you calculate the theoretical probability of an event?

Back

Theoretical probability is calculated as the number of favorable outcomes divided by the total number of possible outcomes.

Front

If a bag has 3 red marbles, 2 blue marbles, 1 yellow marble, and 4 green marbles, what is the total number of marbles?

Back

Total number of marbles = 3 + 2 + 1 + 4 = 10.

Front

What is the theoretical probability of pulling a red marble from the bag?

Back

Theoretical probability = Number of red marbles / Total number of marbles = 3/10.

Front

What are complementary events?

Back

Complementary events are two outcomes of an event that are mutually exclusive and together cover all possible outcomes.

Front

Give an example of complementary events in a card game.

Back

Choosing a red card and choosing a black card are complementary events.

Front

What is the probability of rolling a 2 or a 3 on a standard die?

Back

The probability of rolling a 2 or a 3 is 2/6 or 1/3.

Front

What is the probability of rolling a prime number on a standard die?

Back

The prime numbers on a die are 2, 3, and 5. Probability = 3/6 = 1/2.