7th Grade Probability

Front

What is probability?

Back

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

Front

What does it mean if an event is 'impossible'?

Back

An impossible event has a probability of 0, meaning it cannot happen.

Front

What does it mean if an event is 'certain'?

Back

A certain event has a probability of 1, meaning it will definitely happen.

Front

How do you calculate the probability of an event?

Back

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

Front

What is the probability of selecting a brown candy from a bowl with 4 yellow, 7 orange, 3 green, and 5 blue candies?

Back

0 (impossible) because there are no brown candies.

Front

In a standard deck of cards, what is the probability of drawing a red card?

Back

1/2, since there are 26 red cards out of 52 total cards.

Front

If a spinner is divided into 10 equal sections, what is the probability of landing on a specific number?

Back

1/10, since there is one favorable outcome out of 10 possible outcomes.

Front

If you spin a spinner with 10 equal sections 90 times, how many times should you expect to land on a specific number?

Back

9 times, because 90 spins x (1/10 probability) = 9.

Front

What is the probability of not winning if the probability of winning is 7/10?

Back

3/10, because 1 - 7/10 = 3/10.

Front

What does 'equally likely' mean in probability?

Back

It means that all outcomes have the same chance of occurring.