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Let x stand for the number of minutes spent waiting in line for a rollercoaster at an amusement park. 81 people are sampled at a

Let x stand for the number of minutes spent waiting in line for a rollercoaster at an amusement park. 81 people are sampled at a time.The sample mean is 18 minutes and the sample standard deviation is 0.5 minutes.

What is the standard deviation of the population?

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