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The tree height at the 20 th percentile can be used as measure of longevity. The population height is normally distributed with a mean of

The tree height at the 20th percentile can be used as measure of longevity. The population height is normally distributed with a mean of 211 feet. and a standard deviation of 41.6 feet. Compute the weight of the 20th percentile (that x-value that separates the lower 20% from the upper 80%).tt

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