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4) For a certain type of computers, the length of time bewteen charges of the battery is normally distributed with a mean of 65 hours

4) For a certain type of computers, the length of time bewteen charges of the battery is normally distributed with a mean of 65 hours and a standard deviation of 12 hours. Find the probability that the length of time for any randomly selected computer will be between 61 and 70 hours.

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