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)
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!
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)