The stem-and-leaf diagram below shows the sample of length (in mm) of nails. Stem Leaf  10 2 3 3 11 4 6 12 0 1 7 8 13 3 7 14 5 7 9 16 1 8 17 0 22 2 (a) Calculate the mean.  (b) Determine the first quartile, median and third quartile. [ (c) Hence construct a box-and-whiskers plot for the data and comment.

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