93. Solving a chemistry problem

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16. From the electron microscopic analysis of a sample of silver nanoparticles, the distribution of the number of particles N over the diameter d is found, shown in the table below. Calculate the arithmetic mean diameter d, the standard deviation of the diameter s and the coefficient of variation V (in percent)

d, nm 6.35 6.64 6.93 7.22 7.51 7.80 8.09 8.39 8.68 8.97 9.26 9.55 9.84 9.98
N 1 2 4 8 4 23 17 31 21 32 24 13 11 6

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