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The annual amounts of rainfall in a certain region are modeled using the normal distribution shown below.
The mean of the distribution is 30.8 and the standard deviation is 3.3cm.
In the figure, V is a number along the axis and is under the highest part of the curve.
And, U and W are numbers along the axis that are each the same distance away from V .

Use the empirical rule to choose the best value for the percentage of the area under the curve that is shaded, and find the values of U,V , and W.