Administrators at your school want to estimate how much time students spend on homework, on average, during a typical week. They want to estimate μ at the 90% confidence level with a margin of error of at most 30 minutes. A pilot student indicated that the standard deviation of the time spent on homework per week is about 154 minutes. How many students need to be surveyed to meet the administrator's goal? a.73 b.72 c.70 d.71

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