5) How many commuters must be randomly selected to estimate the mean driving time of 5) Chicago commuters? We want 98% confidence that the sample mean is within 5 minutes of the population mean, and the population standard deviation is known to be 7 minutes. a. Shade and label the missing parts in graph for a 98% confidence interval. (You may use Excel or a calculator to find the z-score. Round the z-score to two decimal places.) Area to the Area to the Area in the right =, left = middle = z = b. The minimum number of commuters that must be randomly selected to be within 4 minutes is having calculator work will not count.) (You must show how you set up and calculate this answer. Only

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