36. For the special case of a binomial random variable, we stated that the variance could be computed using the formula σ2  np(1
p). For the Martin Clothing Store problem with n  3 and p  .3 we found σ2  np(1
p)  3(.3)(.7)  .63. Use the general definition of variance for a discrete random variable, equation (5.5), and the probabilities in Table 5.7 to verify that the variance is in fact .63.