J. Calculate the covariance 2. Suppose that the number of American adults who have confidence in banks has a binomial probability distribution. According to a Gallup poll, 37% of American adults have confidence in banks. Suppose that you interview 18 American adults at random. What is the probability that five persons have confidence in banks? b. What is the probability that no more than seven persons have confidence in banks? c. What is the probability that at least nine persons have confidence in banks? d. What is the expected number of persons who have confidence in banks? e. What is the standard deviation of the number of persons who have confidence in banks? iccon distribution with a mean of 12 cars per hour