A study on air pollution in a major city measured the concentration of sulphur dioxide on 25

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A study on air pollution in a major city measured the concentration of sulphur dioxide on 25 summer days. The measurements were:

3 9 16 23 29 3 11 17 25 35 5 13 18 26 43 7 13 19 27 44 9 14 23 28 46

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

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

(c) Sketch a boxplot of the measurements.

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