A-level Statistics: Normal Distribution P(X Less Than X)

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We show you through an example how to work out probabilities from a normal distribution. A battery has a l...
We show you through an example how to work out probabilities from a normal distribution. A battery has a lifetime which is normally distributed with a mean of 62 hours and a standard deviation of 3 hours. What is the probability of a battery lasting less than 68 hours?
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