Number of heads appearing on first
A fair coin is tossed four times. What is the probability that the number of heads appearing on the first two tosses es equal to the number of heads appearing on the second two tosses?
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SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 9
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OH has 15 residents, 10 are Democrats. In a sample of 4 different voters, what is the probability that exactly 3 are Democrats?
Two players put one dollar each into a pot. They decide to throw a pair of dice alternately. The first one who throws a total of 5 on the two dice wins the pot. How much should the player who starts add to the pot to make this a fair game?
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