Question: 6.44 Explosive devices used in a mining operation cause nearly circular craters to form in a rockysurface. The radii of these craters are exponentially distributed

6.44 Explosive devices used in a mining operation cause nearly circular craters to form in a rockysurface.

The radii of these craters are exponentially distributed with a mean of 10 feet. Find the mean and variance of the area covered by such a crater.

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