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Assume the distribution is normal.

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Assume the distribution is normal. Use the area of the normal curve to answer the question. Round to the nearest whole percent. The average weekly income of teachers in one school district is $390 with a standard deviation of $45. What is the probability of a teacher earning more then $425 a week

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The expert assumes the distribution is a normal to examine a curve.

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From the condition, let X represent the weekly income of teachers, then we get m = 390 and d = ...

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