<PRE><B>Question 316832</B>
A silver dollar is flipped twice. Calculate the proability of each of the following occurring:
Note: The flip results are independent and P(H)=P(T)=1/2
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a) a head on the first flip:: 1/2
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b) a tail on the second flip given that the first toss was a head::1/2
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c) two tails:::(1/2)(1/2) = 1/4
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d) a tail on the first and a head on the second: (1/2)(1/2)= 1/4
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e) a tail on the first and a head on the second or a head on the first and a tail on the second:::(1/2)(1/2) + (1/2)(1/2) = 2/4 = 1/2
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e) at least one head on the two flips::: 1 - P(no heads) = 1-(1/4) = 3/4
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Cheers,
Stan H.
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