find the (a) sample variance and (b) sample standard deviation for each of the following data sets. Round standard deviations to four decimal places.

1. 15, 33, 30, 50, 0

2. -4, 25, -4, 11, 19,4

3. 4.7, 5.6, 2.5, 4.9, 7.3, 4.7, 5.6, 6.5

4. -10,0,3,3,6,16

5. 150,330,300,500,0

6. 0,0,0,100,100,100

7. 50,50,50,50,50,50,50

8. 30,40,50,50,60,70