Basic Probability

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, or as a percentage.

Front

What is the formula for calculating probability?

Back

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

Front

If a bag contains 10 red marbles and 5 blue marbles, what is the probability of drawing a red marble?

Back

P(red) = 10 / (10 + 5) = 10/15 = 2/3.

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

In a spinner divided into 4 equal sections (1, 2, 3, 4), what is the probability of landing on an even number?

Back

P(even) = 2/4 = 1/2.

Front

What is a sample space in probability?

Back

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

Front

What is a favorable outcome?

Back

A favorable outcome is an outcome that satisfies the conditions of the event we are interested in.

Front

If you roll a die, what is the probability of rolling a number greater than 4?

Back

P(greater than 4) = 2/6 = 1/3.

Front

What is a tree diagram?

Back

A tree diagram is a visual representation of all possible outcomes of an event, showing the paths to each outcome.