Basic 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 bag contains 5 green, 6 yellow, 8 blue, and 7 brown M&Ms, what is the total number of M&Ms?

Back

Total M&Ms = 5 + 6 + 8 + 7 = 26.

Front

What is the probability of choosing a blue M&M from the bag?

Back

P(blue) = 8/26 or 4/13.

Front

What is the probability of rolling a sum of 15 with two six-sided dice?

Back

P(sum of 15) = 0.

Front

What is the probability of rolling an odd number on a fair 6-sided die?

Back

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

Front

What is the probability of NOT rolling a 2 on a single fair 6-sided die?

Back

P(NOT 2) = 5/6.

Front

What does the Complement Rule in probability state?

Back

The Complement Rule states that the probability of an event not occurring is equal to 1 minus the probability of the event occurring.

Front

If there is a 40% chance of rain, what is the probability that it will not rain?

Back

P(NOT rain) = 1 - P(rain) = 1 - 0.4 = 0.6 or 60%.

Front

What is a fair die?

Back

A fair die is a die that has an equal chance of landing on any of its faces.