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Calculus/Standard deviation

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Expert: - 5/8/2009


Question
I need help answering this question. Birth weights are normally distributed in Norway with mean of 3570g and a standard deviation of 500g. If a hospital plans to set up observation conditions for the lightest 2% of babies, what weight is the cut off that separates the lightest 2% from the others?

Answer
Using a table for the Normal Distribution (they're found in lots of places), find where 2% are outside on a one-sided distribution.
For the normal table, above or below are the same value.

Multiply this value by the standard deviation (500g, in this case) and subtract from the mean (3570g).  

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