The manager of a government department is concerned about the efciency in which his department serves the public. Speci cally, he is concerned about the delay experienced by members of the public waiting to be served. He takes a sample of 50 arriving customers, and measures the time each waits until service begins. The times (rounded o to the nearest second) are:

(a) Form a stem-and-leaf diagram of the measurements.

(b) Find the median, lower quartile, and upper quartile of the measurements.

(c) Sketch a boxplot of the measurements.

(d) Put the measurements in a frequency table with the following classes:

(e) Construct a histogram of the measurements.

(f) Construct a cumulative frequency polygon of the measurements. Show the median and quartiles.

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