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May 5th, 2017, 12:52 AM   #1
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Shooting on a divided target

There is a target divided into 20 equal parts. The probability of falling into each of them is the same and is equal to 1/20. 15 shots are produced (we can hit one part several times). What is the probability that 8 parts will be shot through?
P.s. A part is shot through when we hit on it at least one time.
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May 23rd, 2017, 01:12 AM   #2
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Let X be the number of parts that will be shot through. Then $\displaystyle X \sim Binomial(n = 15, p = 0.05)$. Can you continue?
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