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Mathematics, 07.11.2019 20:31 CobyHageman
Battery manufacturers compete on the basis of the amount of time their products last in cameras and toys. a manufacturer of alkaline batteries has observed that its batteries last for an average of 32 hours when used in a toy racing car. the amount of time is normally distributed with a standard deviation of 4.5 hours. what is the probability that the battery lasts fewer than 30 hours?
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