Assume a normal distribution and that the average phone call in a certain town lasted 6 ​min, with a standard deviation

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answerhappygod
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Assume a normal distribution and that the average phone call in a certain town lasted 6 ​min, with a standard deviation

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Assume a normal distribution and that the average phone call in
a certain town lasted 6 ​min, with a standard deviation of 1 min.
What percentage of the calls lasted less than 5 ​min?
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