Using the weighed mean, Susan's grade point average is of 1.89.
The weighed mean is given by the sum of all elements in a data-set multiplied by it's weight, divided by the sum of the weights.
In this problem, the grades and the weights are:
Hence, her GPA is given by:
[tex]GPA = \frac{3(2) + 1(5) + 4(1) + 2(1)}{2 + 5 + 1 + 1} = 1.89[/tex]
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