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The weekly incomes of shift foreman for a given industry follow a normal probability distribution. With a mean of $1,000 and a standard deviation of

The weekly incomes of shift foreman for a given industry follow a normal probability distribution. With a mean of $1,000 and a standard deviation of $100, what is the z-value for the income (called X) of a foreman who earns $1100 per week? For a foreman who earns $900 per week?

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