95. Solving a chemistry problem

14. 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 (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).

Task 14
d, nm 5.81 6.10 6.38 6.66 6.95 7.23 7.51 7.80 8.08 8.36 8.65 8.93 9.21 9.36
N 1 2 3 13 15 23 25 26 36 24 16 10 2 1