It Is Known That 80% of All Brand a Zip

Essay

It is known that 80% of all brand A zip drives work in a satisfactory manner throughout the warranty period (are "success"). Suppose that n = 10 drives are randomly selected. Let X = the number of successes in the sample. The statistic X/n 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 probability of this value (what kind of random variable is X)?]