Suppose X is normally distributed. The mean is 174 and 80% of the values are greater than 139. What is the standard devi

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Suppose X is normally distributed. The mean is 174 and 80% of the values are greater than 139. What is the standard devi

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Suppose X is normally distributed. The mean is 174 and 80% ofthe values are greater than 139. What is the standarddeviation?
Suppose X is normally distributed. The standard deviation is 13and 73% of the values are less than 240. What is the mean?
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