Question: I need help as to how to set up an excel worksheet using this question. and how to do the problem. The lifetimes of light

I need help as to how to set up an excel worksheet using this question. and how to do the problem. The lifetimes of light bulbs of a particular type that are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has a lifetimes that lie within 1 standard deviation of the mean on the either side.

I have no idea how to set this up in excel or complete the problem. Could you please show me the steps so that it will assist me better understanding the problem.

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