please answer this with complete solution.

1. Identify the 3 measures of dispersion using the following set of numbers.

12,13,45,45,45,12,12, 10,10,13,15

2. Calculate or solve the population and sample standard deviation of the following scores.

15,15,25,13,32,30,23, 26, 65,45 and 44.

3. Scores of the university of students in an English Proficiency Test

50,25,37,40,28,30,35,50,55,32, and 45.