If a company has 5 employees with annual salaries of 30000 50000 30000 80000 and 70000 respectively what is the mean annual salary at the company

The answer is 52,000.

You have to add all of the values and divide them by the number of values. In this case you would do 30,000 + 50,000 + 30,000 + 80,000 + 70,000 which equals 260,000 then you would divide that number by 5 since there are 5 values.