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Hello, could you please explain the breakdown of this question? I do not understand how the answer arrives at 43.32% Thanks. The lives of certain

Hello, could you please explain the breakdown of this question?

I do not understand how the answer arrives at 43.32%

Thanks.

The lives of certain extra-life light bulbs are normally distributed with a mean equal to 1350 hours and a standard deviation equal to 18 hours.

What percentage of bulbs will have a life between 1350 and 1377 hr?

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