19 . It is known that 12% of consumers purchase a particular brand of soap. In a survey, a random sample of 200 consumers is chosen. a. Find an expression for the probability that the sample will contain more than 30 consumers who purchase the brand of soap. b. Find the mean and standard deviation for the number of consumers in the sample who purchase the soap. c. Use the normal curve to estimate the probability that more than 30 consumers in the sample will purchase the soap