This is the best website for explaining permutations with repeats. I think that the diagram is ideal for explaining this difficult concept. I also enjoy the example of "How many ways can you rearrange the letters in the word "MISSISSIPPI"?"
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Math Warehouse
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This shows examples and step-by-step instructions for using Calculator to find desired probability values.
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MathBits
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5. A student is taking a standardized test consisting several multiple-choice questions. One point is awarded for each correct answer. Questions left blank neither receive nor lose points. If there are six options for each question and the student is penalized 1/3 point for each wrong answer, how many options must the student be able to rule out before the expeced value of guessing zero? The number of options the student must be able to rule out before the expected value of guessing becomes zero is _____
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Tutor.com
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A math teacher is randomly distributing 15 rulers with centimeter labels and 10 rulers without centimeter labels. What is the probability that the 1st ruler she hands out will have centimeter labels and the 2nd ruler will not have labels? On a certain day the chance of rain is 80% in SF and 30% in Sydney. Assume that the chance of rain in the two cities is independent. What is the probabilty that it will not rain in either city? A box contains 7 large red marbles, 5 large yellow marbles, 3 small red marbles, and 5 small yellow marbles. If a marble is drawn at random, what is the probabilty that it is yellow, given that it is one of the large marbles?
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Tutor.com
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conditional probablitlity: let n be a randomly selected integer from 1-20. find the indicated probability.
-n is 2 given that it is even
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Tutor.com
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A box contains 95 balls numbered from 1 to 95. If 14 balls are drawn with replacement, what is the probability that at least two of them have the same number?
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Tutor.com
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In this video, Salman Khan of Khan Academy explains probability. Part 7 of 8.
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Khan Academy
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In this video, Salman Khan of Khan Academy explains probability. Part 6 of 8.
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Khan Academy
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In this video, Salman Khan of Khan Academy explains probability. Part 5 of 8.
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Khan Academy
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In this video, Salman Khan of Khan Academy explains probability. Part 4 of 8.
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Khan Academy
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