Answer:
D. 19 in
Step-by-step explanation:
Given a histogram of monthly rainfall, you want the total for the year.
Total
The total rainfall is the sum of the amounts shown on the dot plot. Each dot represents an amount of rainfall, so adding up the values of the dots gives the total rainfall.
The tedious math can be aided by certain calculator (or spreadsheet) features. These aids can multiply the amount of rain by the number of dots, and sum those products.
The result of this math is a total rainfall of 19 inches for the year.
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Additional comment
We have used the calculator function "dot product." The dot product of two vectors is the sum of products of corresponding components, exactly the calculation we want to make.
On this calculator, ...
DotP({a, b}, {c, d}) ≡ Total({a, b}{c, d}) ≡ ac +bd
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