Lets say you have tossed a fair coin 100 times. What is the probability that you got at least 10 tails?
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You have to use the binomial distribution – Peter Jan 05 '20 at 15:35
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Or an approximation with normal distribution having mean $np=50$ and variance $np(1-p)=25$. – drhab Jan 05 '20 at 15:38
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See also https://math.stackexchange.com/questions/800997/. The duplicates were easy to find. Please make more effort to search existing questions before posting a new one. – joriki Jan 05 '20 at 15:39