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12. The prices of all college textbooks follow a bell-shaped distribution with a mean of $140 and a standard deviation of $20. Sally bought a math textbook for $100. a. Find the deviation of the math textbook price: b. Compute the z-score for the textbook price of $100. What does that mean? c. Use the empirical rule, find the percentage of all college textbooks with their prices between $100 and $160. 13. A small company has five employees. The following table presents the number of years each employed (x) and the hourly wage in dollars (y). x (years) .5 1.75 2.5 3 y (dollars) 15.50 16.80 17.30 18.50 21.4 a. Compute the correlation coefficient. What does it say about the association between x and y? b. Find the equation of the least-squares regression line for predicting the hourly wage. c. If an employee works for another 2 years, by how much will their hourly wage increase? d. Predict the hourly wage if the employee has worked for 2 years. e. Compute the coefficient of determination. How much of the variation are explained by the least-squares regression line