A programmer plans to develop a new soware system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 90% condentthat his estimate is in error by no more than three percentage points? Complete parts {a} through (-2} below. a] Assume that nothing is known about the percentage of computers with new operating systems. n = T52 (Round up to the nearest integer.) bl Assume that a recent survey suggests that about 91% of computers use a new operating system. n=D (Round up to the nearest integer.)