Asked by Gina

Each consumer has a 25% chance of preferring your product over the competitor's product. If we question 15 customers, what is the probability that at least 3 will prefer your product?
Answered by Shelly
1-(3/4)^15-C(15,1)(1/4)(3/4)^14 -C(15,2)(1/4)^2(3/4)^13
Answered by Gina
Do you have an answer that I can check my calculations with? I haven't worked a problem like this in a long time - am trying to help a friend with this problem. We're having trouble calculating it. I'm using a regular calculator, not a scientific one. Any suggestions
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