The Company collected a sample of the salaries of its employees. There are 70 salary data points summarized in the frequency distribution below:
Salary Number of Employees
5,001-10,000 8
10,001-15,000 12
15,001-20,000 20
20,001-25,000 17
25,001-30,000 13
Find the standard deviation.
Find the variance.
Pretty confused on how this is solved. Maybe its because I haven't dealt with that many numbers