The time until a cell phone battery starts to significantly decline has a normal distribution with a mean of 500 charge

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answerhappygod
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The time until a cell phone battery starts to significantly decline has a normal distribution with a mean of 500 charge

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The time until a cell phone battery starts to significantly decline has a normal distribution with a mean of 500 charge cycles and a standard deviation of 120 cycles. if a battery is selected at random find the probability that the battery life will start to decline is between 430 and 670.
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