Find the first, second, third and fourth orders of moments, skewness of the following:

1)11, 11, 10, 8, 13, 15, 9, 10, 14, 12, 11, 8
2)52, 55, 45, 50, 55, 42, 48, 57, 55, 52, 53, 45, 50, 48, 50

3)
 

x 10 10 11 f 32 26 12 4 15 3 18 5 20 20 1