News articles that link to related stories are widely used in Web marketing. With a large number of daily visitors to a Web page1 we model the proportion of daily visitors who click on a link to a related story as approximately a continuous random variable with a beta distribution. The parameters are a = 6 and = l. a. What is the mean and standard deviation of the proportion of visitors who click? b. What is the probability a proportion exeeeds [1.5 8? e. What proportion is exceeded with probability 1133'? d. If 550 visitors view the page, what is the expected number of visitors who click on a liiilt to a related story