Historically, there is a 40% chance of having clear sunny skies in Seattle in July. Let's assume that each day is independent from any other day (although this is not really true). Under this assumption, if you will spend 18 days in Seattle in July, what's the probability of having clear sunny skies on at least 13 of those days? (a)What kind of distribution is this problem and explain why? (b)Solve this exactly. (c) Solve this by approximating using a normal distribution