Repair Bills an Automobile Service Shop Reported the Summary Statistics $\begin{array}{|l|r|}\hline Min & 27 \\Q1 & 88 \\Median & 132 \\Q3 & 308 \\Max & 1442 \\Mean & 284 \\SD & 140 \\\hline\end{array}$

Repair bills An automobile service shop reported the summary statistics shown for repair bills (in $) for their customers last month.
$\begin{array}{|l|r|}\hline Min & 27 \\Q1 & 88 \\Median & 132 \\Q3 & 308 \\Max & 1442 \\Mean & 284 \\SD & 140 \\\hline\end{array}$
a. Were any of the bills outliers? Show how you made your decision.
b. After checking out a problem with your car the service manager gives you an estimate of
"only $90." Is he right to imply that your bill will be unusually low? Explain briefly.

Correct Answer:

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a. Yes. IQR = 308 - 88 = 220. The upper ...

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