4 pts each) 4. Use the following data on weekly salaries at Ace construction company. Mean $820 First quartile (Q1) $770 Median $790 Third quartile (Q3) $825 Mode $815 79th percentile $832 Standard deviation $40 (a) What is the most common salary? (b) What salary did half the employees exceed? (c) About what percent of employees' salaries exceeded $770? (d) About what percent of employees' salaries was less than $832? (e) If the company has 100 employees, what is the total weekly salary of all employees? (f) What salary represents one standard deviation above the mean