There are 30 days in November. What is the probability that a randomly selected person was not born in November?

What is the probability of me guessing your 4-digit pin, given that I know none of the numbers are repeated?

A study of 170 randomly selected American Airlines flights showed that 124 arrived on time. What is the estimated probability of an American Airlines flight arriving late?

Assume the U.S. Senate consists of 24 women and 76 men. If a lobbyist randomly selects three different Senators, what is the probability that they are all women?

If you make random guesses for 5 multiple-choice questions (each with 4 possible answers), what is the probability of getting at least one correct?

What is the probability of rolling a three (dice) and then drawing the king of hearts (cards)?

When you give a casino $5 for a bet on the "pass line" in the game of craps, there is 244/495 probability that you will win $5. (They give you $10 if you win, but the bet costs $5, so you actually only win $5.) There is a 251/495 probability that you will lose you $5. What is the expected value of your $5 bet?

Question 7 options:

Several students are unprepared for a multiple-choice quiz with 10 questions, and all their answers are guesses. Each question has four possible answers, and only one of them is correct. What is the mean and standard deviation for the number of correct answers for such students?

Question 8 options:

In a binomial, the mean = 2 and the standard deviation = 1.27. What is the maximum usual?