Return to the waiting times given for the physician’s office

Return to the waiting times given for the physician’s office in Problem 19.
a. Considering only offices without a wait tracking system, what is the z-score for the tenth patient in the sample (wait time =37 minutes)?
b. Considering only offices with a wait tracking system, what is the z-score for the sixth patient in the sample (wait time = 37 minutes)? How does this z-score compare with the z-score you calculated for part a?
c. Based on z-scores, do the data for offices without a wait tracking system contain any outliers? Based on z-scores, do the data for offices without a wait tracking system contain any outliers?

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