Posted by **Gina** on Tuesday, October 2, 2012 at 5:33pm.

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?

- Statistics - math -
**Shelly**, Tuesday, October 2, 2012 at 5:39pm
1-(3/4)^15-C(15,1)(1/4)(3/4)^14 -C(15,2)(1/4)^2(3/4)^13

- Statistics - math -
**Gina**, Tuesday, October 2, 2012 at 7:33pm
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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