From experience, the manager of Kramer's Book Mart knows that 30% 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 seven will make a purchase?

Step-by-step explanation:

Given that:

prob of at least 7 from 10 will make purchase

= prob(7will buy) + prob(8 will buy) + ..+ prob(10 will buy)

= C(10,7) + C(10,8) + C(10,9) + C(10,10)

= 0.0105

So the probability that among ten people who are browsing in the store, at least seven will make a purchase is: 0.0105

this is not the answer this is just a question. is this middle school math?

step-by-step explanation: