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Suppose the average income of students is $100er day. with a standard deviation of $10, Now a student is selected at random and the mean

Suppose the average income of students is $100er day. with a standard deviation of $10, Now a student is selected at random and the mean income is $100. What percentage of student incomes is below $100?

a. State the formula for Z score

b. Solve for Z

c. Look up the Z normal table

d. Find the area inside the table

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