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[Wa9aif B]

[QUOTE=حنآن ـآلكون;5128170]The mean number of hours an American worker spends on the computer
is 3.1 hours per workday. Assume the standard deviation is 0.5 hour. Find
the percentage of workers who spend less than 3.5 hours on the computer.
Assume the variable is normally distributed

عججزت افهمم هذا السؤال , بليييز احد يفهمني[QUOTE

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