A coin is tossed three times. An outcome is represented by a string of the sort HTT (meaning a head on the first toss, followed by two tails). The 8 outcomes are listed in the table below. Note that each outcome has the same probability.For each of the three events in the table, check the outcome(s) that are contained in the event. Then, in the last column, enter the probability of the event.Outcomes ProbabilityHHT HTH HTT HHH THH TTH THT TTTEvent A: Alternating head and tail (with either coming first) Event B: More heads than tails Event C: A tail on the second toss
Question
A coin is tossed three times. An outcome is represented by a string of the sort HTT (meaning a head on the first toss, followed by two tails). The 8 outcomes are listed in the table below. Note that each outcome has the same probability.For each of the three events in the table, check the outcome(s) that are contained in the event. Then, in the last column, enter the probability of the event.Outcomes ProbabilityHHT HTH HTT HHH THH TTH THT TTTEvent A: Alternating head and tail (with either coming first) Event B: More heads than tails Event C: A tail on the second toss
Solution
The outcomes and their probabilities are as follows:
Outcomes: HHT, HTH, HTT, HHH, THH, TTH, THT, TTT Each outcome has a probability of 1/8 since there are 8 possible outcomes.
Event A: Alternating head and tail (with either coming first) The outcomes that fit this description are HTH and THT. So, the probability of Event A is 2/8 or 1/4.
Event B: More heads than tails The outcomes that fit this description are HHT, HTH, HHH, and THH. So, the probability of Event B is 4/8 or 1/2.
Event C: A tail on the second toss The outcomes that fit this description are HTT, HTH, TTT, and TTH. So, the probability of Event C is 4/8 or 1/2.
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