# Finding a value using the standard normal distribution.

Birth weights are normally distributed with a mean of 3421 g and a standard deviation of 496 g. If a hospital plans to set up special observation conditions for the lightest 3% of babies, what weight is used for the cut-off seperating the lightest 3% from the others?

The cut-off weight that separates the lightest 3% of babies from the others is _________g. (round to the nearest gram as needed)

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Solution: Denote by X the weight of a new born baby. Then x follows a normal distribution with a mean of 3421 g and a standard deviation of 496 ...

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