Simple Probability

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 the probability of an event?

Back

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

Front

If a spinner has 4 equal sections (red, blue, green, yellow), what is the probability of landing on blue?

Back

P(blue) = 1/4.

Front

What does it mean if an event has a probability of 0?

Back

It means the event is impossible and will not occur.

Front

What does it mean if an event has a probability of 1?

Back

It means the event is certain and will definitely occur.

Front

If a number cube (die) is rolled, what is the probability of rolling a 6?

Back

P(6) = 1/6.

Front

What is the probability of rolling a number less than 3 on a number cube?

Back

P(1 or 2) = 2/6 = 1/3.

Front

If a spinner is spun 20 times and the probability of landing on blue is 1/4, how many times should it land on blue?

Back

Expected number of times = 20 * (1/4) = 5 times.

Front

What is the probability of NOT rolling a 6 on a number cube?

Back

P(not 6) = 5/6.

Front

If there are 3 red marbles and 7 total marbles, what is the probability of picking a red marble?

Back

P(red marble) = 3/7.