# Binomial Math

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From experience, the manager of Kramer's Book Mart knows that 40% of the people who are browsing in the store will make a purchase. What is the probability that among ten people who are browsing in the store, at least five will make a purchase? (Round your answer to four decimal places.)

• Binomial Math -

prob of purchase = .4
prob of no purchase = .6

prob of at least 5 from 10 will make purchase

....
lots of arithmetic, I will do the prob 6 will buy
= C(10,6) (.4)^6 (.6)^4
= ..

What might be a shorter way is to exclude the cases of none, 1, 2 , 3 or 4 will buy

• Binomial Math -

.2150

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