The mean cholesterol level in children is 180 mg/dL with standard deviation 39 mg/dL.

Assume this level varies from child to child according to an approximate normal distribution.

Find the maximum level for the bottom 4.8% of all children.

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Find the levels in the middle 60% of the distribution. In other words, find the levels in the top 20% and the bottom 20% of all children.

Top 20%

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Bottom 20%

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