Posted by **Bersy** on Sunday, January 27, 2013 at 2:48pm.

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 -
**Reiny**, Sunday, January 27, 2013 at 4:15pm
prob of purchase = .4

prob of no purchase = .6

prob of at least 5 from 10 will make purchase

= prob(5will buy) + prob(6 will buy) + ..+ prob(10 will buy)

....

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

= 1 - (prob(0 will buy + prob(1 will buy ...+prob(4 will buy)

- Binomial Math -
**D**, Sunday, August 11, 2013 at 9:37pm
.2150

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