# Binomial distribution.

#### Suchy

XYZ has calculated the probability that a customer who comes into the store and buys something is 0.20. Inthe course of a certain day 50 customers visit the store. Calculate the probability that 10 or fewer customers make a purchase on this particular day.

More important for me is result than the formula.

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#### mr fantastic

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XYZ has calculated the probability that a customer who comes into the store and buys something is 0.20. Inthe course of a certain day 50 customers visit the store. Calculate the probability that 10 or fewer customers make a purchase on this particular day.

More important for me is result than the formula.
X ~ Binomial(n = 50, p = 0.20).

Calculate $$\displaystyle \Pr(X \leq 10)$$.

Suchy