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Earn +20 ptsQ: What is the probability of obtaining tails and a three?
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What is the probability of obtaining tails or a three?
The answer depends on what the experiment is!
What is the probability that you get three tails given that you get at least two tails if ou flip three coins?
1/4
What is the probability of obtaining exactly two heads in three flips of a coin given that at least one is a head?
The probability of obtaining exactly two heads in three flips of a coin is 0.5x0.5x0.5 (for the probabilities) x3 (for the number of ways it could happen). This is 0.375. However, we are told that at least one is a head, so the probability that we got 3 tails was impossible. This probability is 0.53 or 0.125. To deduct this we need to divide the probability we have by 1-0.125 0.375/(1-0.125) = approximately 0.4286
What is the probability of obtaining three heads?
Probably 3/4
What is the probability of obtaining tails or a six?
The answer depends on the experiment: how many coins are tossed, how often, how many dice are rolled, how often.
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