The monthly income of trainees at a local factory are normally distributed with a mean of $1600 and a standard deviation

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answerhappygod
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The monthly income of trainees at a local factory are normally distributed with a mean of $1600 and a standard deviation

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The monthly income of trainees at a local factory are normally distributed with a mean of $1600 and a standard deviation $150. What percentage of trainees earn less than $1390 a month?
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