A coin was tossed 300 times, and tail appeared 180 times. What is the probability of getting a tail in this experiment ??
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Tossing coins is what statisticians call a Bernoulli trial or a binomial trial. You can use the to measure how extreme this event is.
It turns out that the probability of getting at least 490 heads (490 or more) from 900 tosses of an unbiased coin is 0.00421. This is very low.
So the answer is that it is very unlikely that the coin is not biased.
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