6.1 Flashcard Probability Distributions

Front

What does P(Y<3) mean?

Back

The probability that the random variable Y is less than 3.

Front

What is P(X > 2)?

Back

0.2

Front

Find the probability for at least 4 questions correct on a 5 question true-false quiz.

Back

.1875

Front

If the event will _________, then its probability is 0.

Back

never happen.

Front

All of the probabilities in a probability distribution add up to what?

Back

1.

Front

What is a probability distribution?

Back

A function that describes the likelihood of obtaining the possible values that a random variable can take.

Front

What is the range of probabilities in a probability distribution?

Back

0 to 1.

Front

What does it mean if P(X = x) is 0?

Back

The event X = x is impossible.

Front

What is the sum of probabilities for all possible outcomes in a discrete probability distribution?

Back

1.

Front

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

Back

1.