In a population, 10% have 1 story home, 50% have 2 story home and 40% have 3 story home, after speaking with 300 people, what is the chance that more than 40% live in a 3 story homes?

the answer is 0.5 but how to get to this? thanks!

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- Nov 25th 2009, 05:22 PMxingzProbability question
In a population, 10% have 1 story home, 50% have 2 story home and 40% have 3 story home, after speaking with 300 people, what is the chance that more than 40% live in a 3 story homes?

the answer is 0.5 but how to get to this? thanks! - Nov 25th 2009, 06:19 PMpickslides
read these posts on binomial probability.

http://www.mathhelpforum.com/math-he...ent-given.html

http://www.mathhelpforum.com/math-he...ributions.html

In your case p=0.4, n=3000 and k = 1200

Find P(X>1200) - Nov 26th 2009, 03:40 PMmatheagle
n=300, k=120

and it's $\displaystyle P(Binomial >120)$ where you should add the .5 for

the correction factor

$\displaystyle \approx P(Normal >120.5)$