Probability Practice

Front

What is probability?

Back

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

Front

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

Back

An event with a probability of 0 means that it is impossible for that event to occur.

Front

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

Back

An event with a probability of 1 means that it is certain to occur.

Front

How do you calculate the probability of an event?

Back

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

Front

What is the sample space in probability?

Back

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

Front

If 3 out of 12 students are on their cell phones, what is the probability that a student is NOT on their cell phone?

Back

P(Not on cell phone) = 1 - P(On cell phone) = 1 - (3/12) = 9/12 = 75%.

Front

What is a combination in probability?

Back

A combination is a selection of items from a larger set where the order does not matter.

Front

What is the difference between 'with replacement' and 'without replacement'?

Back

'With replacement' means that after an item is drawn, it is put back into the set before the next draw. 'Without replacement' means that once an item is drawn, it is not returned to the set.

Front

How do you find the probability of drawing two purple marbles from a box without replacement?

Back

Front

What is a favorable outcome in probability?

Back

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