If there is a 20% probability of rain for each of the next 7 days, what is the probability that it will rain on exactly 1 of the next 7 days?

Question

anonymous · Answer

This is binomial distributed with parameters n=7 and p=0.2

anonymous · Answer

.37      .63       .5     0r .43

anonymous · Answer

Well, there's a formula that comes with the binomial distribution: $$P(X=x)=\left(\begin{matrix}n \ c\end{matrix}\right)p^{x}(1-p)^(n-x)$$
I'm sure you can fill all the values in?

anonymous · Answer

Thank you

anonymous · Answer

what woud x be

anonymous · Answer

1

anonymous · Answer

The amount of the days it rains.

anonymous · Answer

The latex failed there, so here's pretty typography for the formula: http://www.wolframalpha.com/input/?i=binomial+distribution+pdf

anonymous · Answer

oh alright that makes more sence