How to answer question (c)?

Question 3 A professional wedding photographer knows from years of experience that, on average, only one third of his photographs are acceptable to his clients. If the photographer takes 600 photographs at weddings during one weekend, use the binomial distribution to find the probability that more than 200 will be considered acceptable. Give your answer correct to 4 decimal places. XNB ( 600, 3 ) PC X > 200 ) = 1- 1(x $ 200) = 1- 0. 579 2 = 0- 4808 C For a particular wedding party, find (using a table function on your graphics calculator) the minimum number of photographs that must be taken for the photographer to be more than 90% sure that at least two photographs will be acceptable