Pre-Calculus

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In one game of video...

In one game of video poker, the probability of a flush is 1 in 500. I play this game 500 times, independently. What is the probability of at least two flushes in these 500 games?

Let X be a normal random variable with mean 0 and standard deviation 5. Let Y =|X|. Find the median of Y.

I give a ten question true/false statistics test to a class of ten chimpanzees. The chimpanzees, who do not know any statistics, randomly guess true or false, independently for each question and independently of each other. A score of at least 8 out of 10 is required to pass the test What is the probability that at least one of the chimpanzees passes the test?

Let X be a normal random variable with mean 0 and standard deviation 5. Let Y =|X|. Find the median of Y.

I give a ten question true/false statistics test to a class of ten chimpanzees. The chimpanzees, who do not know any statistics, randomly guess true or false, independently for each question and independently of each other. A score of at least 8 out of 10 is required to pass the test What is the probability that at least one of the chimpanzees passes the test?

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