A programmer plans to develop a new software 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​% confident that his estimate is in error by no more than three percentage points? ​a) Assume that nothing is known about the percentage of computers with new operating systems. n= ​b) Assume that a recent survey suggests that about 91​% of computers use a new operating system. n=

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