EXERCISES 1) If the values 5, 8, 6 and 2 occur with frequencies 3, 2.4 and 1, respectively, then the arithmetic mean will be:

2) You have been asked to buy several lots to build your Company's headquarters. You managed to buy 8 lots at R$70,000 each, then 15 to 90,000 each and finally 7 lots at R$100,000 each. What is the average price of the lots?

3) In the SP1 production sector there are 6 employees who receive an average of R$510.00 per month. If you include the salary of the SP1 boss, the average monthly salary for this sector is R$600.00. The salary of the head of the sector is:

4) The 4 salary levels of company K had readjustments of 2%, 3%, 4% and 2% respectively. At these levels, the company has 20, 70, 30 and 10 employees respectively. The average adjustment given by the company to its employees was approximately:

5) In the company KKI, the 5 salary levels involve 10%, 20%, 40%, 20% and 10% of the company's employees. Employees received adjustments of 2%, 2.5%, 3%, 2% and 1%, respectively. The average adjustment given by the company was approximately:

6) In a room there are 6 students with an average age of 21 years, with the arrival of the teacher the average age increased to 25 years. How old will the teacher be?

7) In a sample of 6 salaries, we found the values: R$ 600.00, R$ 800.00, R$ 900.00, R$ 900.00, R$ 750.00 and R$ 850.00. The average salary of an employee in this sample will be:

8) In a sample of 8 employees, we find the salaries: BRL 600.00, BRL 800.00, BRL 1,000.00, BRL 900.00, BRL 800 .00, BRL 1,100.00, BRL 1,100.00 and BRL 900.00. The average salary of an employee in this sample and the total range of this set will be respectively:

9) In a room there are 10 students with an average age of 21 years, with the arrival of the teacher, the average age has risen to 23 years. The teacher's average teacher age is: