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?

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?

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?

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).

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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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.

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

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

The average of 10 test scores is 120 and the average of 30 additional scores is 100.

Quantity A: The weighted average of these scores

Quantity B: 105