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Apple claims that the expected battery life for its newest iPhone X is 12 hours of...

Apple claims that the expected battery life for its newest iPhone X is 12 hours of internet use when fully charged. Assume that the battery life is normally distributed a with standard deviation of 2.5 hours.

  1. If the battery life of a randomly selected iPhone X is in the lower 10% of battery life, what is the

    battery life of that iPhone X?

Math   Statistics-And-Probability   
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