Compute the z-score corresponding to each of the values of x below. a. xequals45, sequals5, x overbarequals30 b. xequals87, muequals86, sigmaequals2 c. muequals45, sigmaequals5, xequals45 d. sequals6, xequals47, x overbarequals50 e. in parts a-d, state whether the z-score locates x within a sample or a population. f. in parts a-d, state whether each value of x lies above or below the mean and by how many standard deviations.