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The mean and the standard deviation of the life time of a type of a solar...

The mean and the standard deviation of the life time of a type of a solar panel is assumed to be 2500 weeks and 200 weeks respectively. Assume that the life time of solar panels follows a normal distribution. At what length of life should the guarantee be set in order for 98 per cent of solar panels to be found satisfactory?

Math   Statistics-And-Probability   
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