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Mathematics 27 Online
OpenStudy (anonymous):

You throw a coin 5 times. What is the probability that the coin will land heads exactly 3 times? What is the probability that the coin willl land heads the first and last time?

OpenStudy (amistre64):

since the probability of a fair coin is 1/2 for either side: this simplifies to the number of times you can get 3 out of 5, time (1/2)^5

OpenStudy (amistre64):

since there is only 1 way to get the second option: its just 1 out of all the difference events

OpenStudy (amistre64):

which i want to say simplifies to (1/2)^5

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