Describe weighted average

Explained below

Explanation:

In simple average, we just add all the given data variables and divide it by the number of data given.

However, when it comes to weighted average, what we do is that we multiply each given variable by their weights and then divide the sum of that by the sum of the weights.

Thus, if the variables are denoted by x and their weights are denoted by y, then we have;

Weighted average = Σ(xy)/Σy

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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tracks, burrows, eggshells, nests, tooth marks, or gastroliths