Size analysis was carried out on a sample of gravel. The data for mass fraction (xi) and average particle diameter (Dpi) of the fraction is given in the table below:The mass mean diameter of the sample, to the nearest integer, is ________mm.Correct answer is '13'. Can you explain this answer?

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Size analysis was carried out on a sample of gravel. The data for mass fraction (x_i) and average particle diameter (D_pi) of the fraction is given in the table below:

The mass mean diameter of the sample, to the nearest integer, is ________mm.

Correct answer is '13'. Can you explain this answer?

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Size analysis was carried out on a sample of gravel. The data for mass fraction (xi) and average particle diameter (Dpi) of the fraction is given in the table below:The mass mean diameter of the sample, to the nearest integer, is ________mm.Correct answer is '13'. Can you explain this answer?

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