Prob. of rain at dive location given as 0.2 each day.

[amanda]

Sean tells prospective clients that the probability of rain at the dive location is .2 each day. Which expression can be used to calculate the probability that it will rain on exactly 5 days of the 7 days at the dive location?

Can you explain to me how to do it?

 

[pka]

Re: Probablity

You must assume independence.
\(\displaystyle {7 \choose 5}(0.2)^5(0.8)^2\)