Math (Statistics)
posted by Heather .
I am to find the mean, variance, and standard deviation for the probability distribution. I don't even know where to start. Here is the problem
x P(x)
0 0.19
1 0.32
2 0.28
3 0.21

In google type:
wikipedia mean variance standard deviation
When you see list of results click on pages in list.
Then in google type:
mathisfun Standard Deviation Calculator
When you see list of results click on:
mathsisfuncom/data/standarddeviationcalculator.html
When page be open type your numbers and click ENTER button on your keyboard. You will see result. 
This is not right. I know how to find the mean, variance, and standard deviation normally. This problem is for probability distribution, which is an entirely different formula.