42. When shooting at a target in a two-dimensional plane, suppose that the horizontal miss distance is

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42. When shooting at a target in a two-dimensional plane, suppose that the horizontal miss distance is normally distributed with mean 0 and variance 4 and is independent of the vertical miss distance, which is also normally distributed with mean 0 and variance 4. Let D denote the distance between the point at which the shot lands and the target.

Find E[D].

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