Use the distribution obtained in Exercise 2.12 on page 33 to find the mean and the standard deviation of the particle sizes. Also determine the coefficient of variation.

Data From Exercise 2.12

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2.12 The following are the sizes of particles of cement dust (given to the nearest hundredth of a micron) in a ce- ment factory: 16.12 10.48 11.12 16.18 18.13 19.10 13.21 10.12 21.18 15.12 10.11 13.31 18.61 11.43 18.26 13.77 13.24 12.16 17.19 11.36 12.53 13.25 10.67 15.45 14.28 14.32 15.18 14.21 10.20 15.64 11.68 18.76 19.32 17.50 11.46 20.59 16.38 21.42 16.27 21.30 16.12 10.55 11.49 15.48 11.62 13.54 13.69 16.72 15.11 14.33 17.23 17.22 19.37 10.41 18.28 19.29 21.23 12.56 12.57 11.60 15.24 21.65 20.70 11.44 12.22 19.34 20.35 19.47 21.63 19.40 19.75 21.71 15.19 18.51 10.58 13.52 11.39 13.66 21.73 11.74 Group these figures into a table with a suitable number of equal classes and construct a histogram.