An urn contains 1000 balls, fifty are green and 950 are white. one ball is chosen from the urn 100 times with replacement. use excel (binom. dist) or megastat to find the probability that six or seven green balls are selected. (b) an urn contains 1000 balls, fifty are green and 950 are white. one ball is chosen from the urn 1000 times. use excel (binom. dist) or megastat to find the probability that between 60 and 70 of the balls, inclusive, are green. (c) redo (a) and (b) again using the normal approximation using excel (normal. dist) or megastat or standard normal tables. how do the answers compare with the above? are there any discrepancies? if so, explain why they happened.