Probability Unit Review

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, where 0 indicates impossibility and 1 indicates certainty.

Front

How do you calculate the probability of an event?

Back

The probability of an event is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

Front

What is the probability of choosing a red block from a bag containing 15 blue, 20 red, and 35 yellow blocks?

Back

P(red block) = 20 / (15 + 20 + 35) = 20 / 70 = 2/7.

Front

What is a spinner in probability?

Back

A spinner is a circular device divided into sections, each representing a different outcome. When spun, it can land on any of the sections, and the probability of landing on a section is based on its size relative to the total area.

Front

If a spinner has 4 equal sections, what is the probability of landing on any one section?

Back

P(section) = 1/4 or 25%.

Front

What does it mean to expect an outcome in probability?

Back

To expect an outcome means to predict how many times an event will occur based on its probability and the number of trials.

Front

If the probability of hitting a hole in one is 2/5, how many times can you expect to hit it in 40 attempts?

Back

Expected hits = Probability x Number of attempts = (2/5) x 40 = 16.

Front

What is a tree diagram in probability?

Back

A tree diagram is a visual representation that shows all possible outcomes of an event, branching out from a starting point.

Front

How do you find the total number of outcomes using a tree diagram?

Back

Multiply the number of options at each branch of the tree to find the total number of outcomes.

Front

What is the probability of choosing a letter other than 'A' from the word 'ALGEBRA'?

Back

Total letters = 7; Letters other than 'A' = 5. P(not A) = 5/7.