Suppose that a random variable X follows binominal distrubution with n=40. p=0.7. Describe the mean, standard deviation and shape of the distribution of X. Find the most resonable answer. a. mean: 28, SD: 2.898, shape: skewed to the left b. mean: 28, SD: 2.898, shape: roughly symmetric c. mean: 20, SD: 8.4, shape: skewed to the left d. mean 28, SD: 8.4, shape: roughly symmetric