A fair coin is tossed 3 times, what is the probability that at least one head appears?
Answers
Answer:
3 probabilities are there
Answer:
This way, we know that from the possible scenarios, only 1 can occur. This being three tails in a row.
since we know that a fair coin has two sides and therefore, each side has a 1/2 chance, we can use the formula for AND scenarios in probability.
This gives us this:
P(3Tails) = 1/2*1/2*1/2
(1/2 times 1/2 times 1/2)
From here, we can then do fraction multiplication and get a value for the probability of P(3tails) = 1/8.
Since we now have the probability of no heads occurring, we can reverse it to have every scenario where at least 1 head occurs. Which happens to be every other scenario.
Since we know that all probabilities all must be equal to 1,
1–1/8 will give us P(at least 1 heads)
Which is equal to 7/8.
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