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Help me with the following problem please An important feature of batteries for a cell phone...

Help me with the following problem please
An important feature of batteries for a cell phone is the number of hours it runs before needing to recharge. A manufacturer advertises that its batteries operate over a 48 hour period with a standard deviation of 2 hours. Determine the range that contains at least 95% of the cell phone's battery operating periods.

math   Statistics-And-Probability   
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