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20% of the population of a city wears glasses. If you randomly stop people from the...

20% of the population of a city wears glasses. If you randomly stop people from the city:

1) The PMF is P(X=x) =

2) What is the probability that it takes exactly 10 tries to get a person who wears glasses

3) What is the probability that it takes at least 10 tries to get a person who wears glasses

Math   Statistics-And-Probability   
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