A local department store estimates that 10 percent of its customers return the merchandise they purchase. Let the random variable r r represent the number of returns for a random sample of 40 customers. Assume that random variable r r follows a binomial distribution. What is described by the value of (408)(0. 1)8(0. 9)32 ( 40 8 ) ( 0. 1 ) 8 ( 0. 9 ) 32 ?.