Discrete Probability & Expected Values

Front

What is the definition of probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 (impossible event) and 1 (certain event).

Front

What does a probability of 0 mean?

Back

A probability of 0 means that the event is impossible and cannot occur.

Front

What does a probability of 1 mean?

Back

A probability of 1 means that the event is certain to occur.

Front

What is an expected value in probability?

Back

The expected value is the average outcome of a random variable, calculated as the sum of all possible values, each multiplied by its probability.

Front

How do you calculate the expected value of a discrete random variable?

Back

To calculate the expected value, multiply each possible outcome by its probability and sum all these products.

Front

What is the probability of an event that is as likely to happen as not?

Back

The probability of an event that is as likely to happen as not is 0.5.

Front

If a spinner has 6 equal sections, what is the probability of landing on any one section?

Back

The probability of landing on any one section is 1/6.

Front

What is the probability of an event that is certain to happen?

Back

The probability of an event that is certain to happen is 1.

Front

What is the formula for calculating the expected number of children in a household given probabilities?

Back

Expected number = (Probability of 1 child * 1) + (Probability of 2 children * 2) + (Probability of 3 children * 3).

Front

What is the probability of an event that is unlikely to happen?

Back

An unlikely event has a probability greater than 0 but less than 0.5.