Probability #1 (Basics, And/Or)

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 the formula for calculating probability?

Back

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

Front

What does it mean for events to be independent?

Back

Two events are independent if the occurrence of one does not affect the occurrence of the other.

Front

What does it mean for events to be dependent?

Back

Two events are dependent if the occurrence of one event affects the probability of the other event.

Front

What is the probability of rolling a die and getting a 3?

Back

1/6, since there is one favorable outcome (rolling a 3) out of six possible outcomes.

Front

What is the probability of rolling a die and getting an even number?

Back

3/6 or 1/2, since there are three even numbers (2, 4, 6) out of six possible outcomes.

Front

What is the probability of getting heads when flipping a coin?

Back

1/2, since there are two possible outcomes (heads or tails) and one favorable outcome (heads).

Front

What is the probability of getting a letter that is not A from the alphabet?

Back

25/26, since there are 25 letters that are not A out of 26 total letters.

Front

What is the probability of rolling a 1 or a number greater than 3 on a die?

Back

2/3, since the favorable outcomes are 1, 4, 5, and 6 (4 outcomes) out of 6 total outcomes.

Front

What is the probability of selecting a boy from a group of students?

Back

(Number of boys) / (Total number of students), depending on the specific numbers.