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Mth 101 Mathematics for commerce Omestion 1 [7 marks] The length of time, in hours, that a phone will work before it needs charging is

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Mth 101 Mathematics for commerce

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Omestion 1 [7 marks] The length of time, in hours, that a phone will work before it needs charging is normally distributed with a mean of 100 hours and a standard deviation of 15 hours. Find the probability that the battery will last : aj More than 127 hours Between 76 and 124 hours

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