1.) In a large on-the-job training program, half of the participants are female and half are male. In a random sample of six participants, what is the probability that an investigator will draw at least two males?† (Round your answer to four decimal places.)
P(X ≥ 2)
2.) The probability that a randomly selected teenager watched a rented video at least once during a week was 0.72. What is the probability that at least 8 teenagers in a group of 10 watched a rented movie at least once last week? (Round your answer to four decimal places.)
P(X ≥ 8) =
3.) Assume that on a standardized test of 100 questions, a person has a probability of 80% of answering any particular question correctly. Find the probability of answering between 78 and 88questions, inclusive. (Assume independence, and round your answer to four decimal places.)
P(78 ≤ X ≤ 88) =