The relief time provided by a standard dose of a popular children's allergy medicine averages six hours

Question:

The relief time provided by a standard dose of a popular children's allergy medicine averages six hours with a standard deviation of two hours.

a. Determine the percentage of children who experience relief for less than four hours if the relief time follows a normal distribution.

b. Determine the percentage of children who experience relief for less than four hours if the relief time follows a lognormal distribution.

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