# Standard Normal Distribution

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Suppose the average age of a passenger train car is 19.8 years. If the distribution of ages is normal and 18% of the cars are older than 21.6 years, find the standard deviation. Round the answer to two decimal place.

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Calculates the value of standard deviation using normal distribution.

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Suppose the average age of a passenger train car is 19.8 years. If the distribution of ages is normal and 18% ...

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