A fair coin is flipped three times.a) State the sample space. List outcomes separated by commas. Use notation like HTT to mean the first toss was heads, the second toss was tails and the third toss was tails. { }b) Find the probability of getting all heads. Leave your answer as a fraction. c) Find the probability of getting at least 2 tails. Leave your answer as a fraction. d) Find the probability of getting an even number of tails. Leave your answer as a fraction. e) Find the probability of getting all heads or all tails. Leave your answer as a fraction. f) Find the probability of getting exactly two heads or exactly two tails. Leave your answer as a fraction. g) Find the probability of not getting at least 2 tails. Leave your answer as a fraction. Submit QuestionQuestion 8
Question
A fair coin is flipped three times.a) State the sample space. List outcomes separated by commas. Use notation like HTT to mean the first toss was heads, the second toss was tails and the third toss was tails. { }b) Find the probability of getting all heads. Leave your answer as a fraction. c) Find the probability of getting at least 2 tails. Leave your answer as a fraction. d) Find the probability of getting an even number of tails. Leave your answer as a fraction. e) Find the probability of getting all heads or all tails. Leave your answer as a fraction. f) Find the probability of getting exactly two heads or exactly two tails. Leave your answer as a fraction. g) Find the probability of not getting at least 2 tails. Leave your answer as a fraction. Submit QuestionQuestion 8
Solution
a) The sample space for flipping a coin three times is: {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
b) The probability of getting all heads (HHH) is 1 out of 8, or 1/8.
c) The probability of getting at least 2 tails is the sum of the probabilities of getting exactly 2 tails and exactly 3 tails. There are 3 outcomes with exactly 2 tails (HTT, THT, TTH) and 1 outcome with exactly 3 tails (TTT), so the probability is 4/8, or 1/2.
d) The probability of getting an even number of tails is the sum of the probabilities of getting 0 tails (HHH) and 2 tails (HTT, THT, TTH). So, the probability is 4/8, or 1/2.
e) The probability of getting all heads or all tails is the sum of the probabilities of getting all heads (HHH) and all tails (TTT). So, the probability is 2/8, or 1/4.
f) The probability of getting exactly two heads or exactly two tails is the sum of the probabilities of getting exactly 2 heads (HHT, HTH, THH) and exactly 2 tails (HTT, THT, TTH). So, the probability is 6/8, or 3/4.
g) The probability of not getting at least 2 tails is the sum of the probabilities of getting 0 tails (HHH) and 1 tail (HHT, HTH, THH). So, the probability is 4/8, or 1/2.
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