WDYE Flashcard Review 2025

Front

What is theoretical probability?

Back

Theoretical probability is the likelihood of an event occurring based on all possible outcomes, calculated as the number of favorable outcomes divided by the total number of outcomes.

Front

How do you express probability as a percent?

Back

To express probability as a percent, multiply the probability (as a fraction) by 100 and add the % sign.

Front

What is a tree diagram?

Back

A tree diagram is a visual representation used to show all possible outcomes of an event, helping to calculate probabilities.

Front

What is the probability of choosing a green marble if there are 4 green marbles out of 10 total marbles?

Back

The probability is 4/10 or 40%.

Front

How do you calculate the probability of an event not occurring?

Back

To calculate the probability of an event not occurring, subtract the probability of the event from 1.

Front

What is the probability of NOT choosing a blue marble if there are 2 blue marbles out of 10 total marbles?

Back

The probability is 8/10 or 4/5.

Front

If the probability of getting a 5 is 1/2, how many times would you expect to get a 5 in 42 spins?

Back

You would expect to get a 5 approximately 21 times.

Front

What is the probability of getting pancakes, apple, and water for your meal if the total outcomes are 18?

Back

The probability is 1/18.

Front

How do you write a probability as a fraction?

Back

To write a probability as a fraction, express the number of favorable outcomes over the total number of outcomes.

Front

What does it mean if the probability of an event is 0?

Back

If the probability of an event is 0, it means the event cannot occur.