Question: You plan to develop a new software system that you believe will be better than Google and Facebook combined. In planning the operating system, you

You plan to develop a new software system that you believe will be better than Google and Facebook combined. In planning the operating system, you need to estimate the percentage of computers that use Windows. How many computers must be surveyed in order to be 99% confident that your estimate is in error by no more than two percentage points? A recent survey suggests that about 90% of computers use Windows operating systems.

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