Which of the following are independent events? select all that apply

1.you flip a coin and roll a number cube.
2.you draw a marble from a bag, replace it, and draw again.
3.you randomly choose 2 socks from a drawer, hoping they will match.
4.you draw two numbers from 1 to 10 from a hat without replacing the first.

Independent events are events which do not affect each other in any way. Therefore the independent events from this list are as follows: 
1, 2.
If you flip and coin, it isn't going to affect the outcome of the dice. Similarly, if you draw a marble form a bag and REPLACE it, you will still have the same number of marbles in the 2nd draw, meaning that the first draw wouldn't affect it. 

Ifound this on google “a skewed (non-symmetric) distribution is a distribution in which there is no such mirror-imaging. a "skewed right" distribution is one in which the tail is on the right side. a "skewed left" distribution is one in which the tail is on the left side. the above histogram is for a distribution that is skewed right.” i hope this you for what your looking for