A random variable is normally distributed with a mean of 500 and a standard deviation of 20.

A

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Probability of the event that

B

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There are 31 students in the library.

Quantity A: The probability that all students have their birthdays in January. (There are 31 days in January).

Quantity B: The probability that all students have their birthdays on a Saturday this year. (Assume there are 52 Saturdays in a year).

The probability that events A and/or B will occur is 0.88.

Quantity A: The probability that event A will occur.

Quantity B: 0.44.

A high school has 200 students. 120 are male, 50 are upper division students, and 40 are upper division male students. What is the probability of choosing a lower division female student, given the student is female?

Presented with a deck of fifty-two cards (no jokers), what is the probability of drawing either a face card or a spade?

The probability that event A occurs is 0.22. The probability of event B occuring is 0.35. If the probability of event C occuring is 0.33, and the probability of event A or event B occuring is 0.54, then the probability of event C occuring is how many times the probability of event A and B occuring?

A coin is flipped four times. What is the probability of getting heads at least three times?

A coin is flipped seven times. What is the probability of getting heads six or fewer times?

Two six-sided dice are rolled.

Quantity A: The probability of rolling a total of 6

Quantity B: The probability of rolling a total of 9

At Jill's school fair, there is a game with 25 balloons hung on a dart board. 10 are blue, 8 are red, and 7 are green. Jill throws a dart and pops a blue balloon. What is the probability that the next balloon she hits will also be blue?