98. Решение задачки по химии №00212

17. From electron microscopic analysis of a sample of silver nanoparticles, the distribution of the number of particles N over diameter d was found, shown in the table below (for the corresponding problem number). Calculate (for your problem number) the arithmetic mean diameterd, the standard deviation of the diameter s and the coefficient of variation V (in percent).
Problem 17
d,nm 7.11 7.41 7.71 8.01 8.31 8.61 8.91 9.20 9.50 9.80 10.10 10.40 10.70 10.85
N 1 3 5 7 11 19 24 39 25 21 21 14 5 2

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