It is known that 80% of all brand A zip drives work in a sat- isfactory manner throughout the warranty period (are "suc- cesses"). Suppose that n = 10 drives are randomly selected. Let X = the number of successes in the sample. The statistic Xn is the sample proportion (fraction) of successes. Obtain the sampling distribution of this statistic. [Hint: One possible value of X/n is .3, corresponding to X=3. What is the prob- ability of this value (what kind of random variable is X)?]