Probability (middle school)

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1, where 0 means the event will not happen and 1 means it will definitely happen.

Front

What is the theoretical probability formula?

Back

Theoretical probability is calculated using the formula: P(Event) = Number of favorable outcomes / Total number of possible outcomes.

Front

If a bag contains 3 red marbles and 2 blue marbles, what is the probability of selecting a red marble?

Back

P(Red) = 3/(3+2) = 3/5.

Front

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

Back

A probability of 0% means that the event cannot occur.

Front

What does it mean if an event has a probability of 100%?

Back

A probability of 100% means that the event is certain to occur.

Front

How do you calculate the probability of multiple independent events occurring?

Back

To find the probability of multiple independent events occurring, multiply the probabilities of each individual event.

Front

What is the probability of selecting a yellow candy from a bowl with 4 yellow, 6 orange, and 3 green candies?

Back

P(Yellow) = 4/(4+6+3) = 4/13.

Front

What is a sample space in probability?

Back

A sample space is the set of all possible outcomes of a probability experiment.

Front

If a jar contains 2 pink, 6 red, and 4 blue marbles, what is the probability of picking a red or blue marble?

Back

P(Red or Blue) = (6+4)/(2+6+4) = 10/12 = 5/6.

Front

What is the probability of selecting a brown candy from a bowl with 4 yellow, 6 orange, 3 green, 5 blue, and 2 brown candies?

Back

P(Brown) = 2/(4+6+3+5+2) = 2/20 = 1/10.