How do I solve these problems? Can you show me the detailed explanation/works?

Note: 1. Total 20 points (each 5 points x 4 problems) 2. Open books/Notes 3. Show me your works for max. credits 4. Submit: sehwan yoo@fitnyc.edu Problem Sample A 17,18,19,20,21,22,23 Sample B 5,10,15,20,25,30,35 1. Find mean of the two samples. 2. Find stand deviations of two samples. 3. Compare and Interpret two samples with the results of your obtained the standard deviation in No. 2. 4. Find a coefficient of variation, CV