7-2. The life X of a new miniature battery is uniformly distributed between 48 and 55 hours...

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7-2. The life X of a new miniature battery is uniformly distributed between 48 and 55 hours of continuous use. Law enforcement use requires that it last at least 51 hours. What is the probability that X exceeds the law enforcement standard? What is the probability that X is within ±σ of the 51 hour requirement?

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