A survey records the time, in minutes past 7:007:00 A.M., that a random sample of 3030 students wake up for an early class. The population standard deviation is known to be 2525 minutes. Calculate the point estimate of the population mean, μ\mu, and the margin of error for a 90%90\% confidence interval.60 75 90 85 70 65 80 95 100 6085 90 75 80 70 65 90 100 85 8075 70 65 60 95 100 85 80 75 70\begin{gathered}60~~75~~90~~85~~70~~65~~80~~95~~100~~60\\85~~90~~75~~80~~70~~65~~90~~100~~85~~80\\75~~70~~65~~60~~95~100~~85~~80~~75~~70\end{gathered}

xˉ≈79.2 min\bar{x}\approx{79.2~\text{min}} E≈7.5 minE\approx{7.5~\text{min}}

xˉ≈79.2 min\bar{x}\approx{79.2}~\text{min}E≈8.9 minE\approx8.9~\text{min}

xˉ≈81.9 min\bar{x}\approx{81.9}~\text{min}E≈8.9 minE\approx8.9~\text{min}

xˉ≈81.9 min\bar{x}\approx{81.9~\text{min}}E≈7.5 minE\approx{7.5}~\text{min}

A survey records the time, in minutes past 7:007:00 A.M., that a ...

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