Question

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

Answer 1

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/standard-deviation-calculator.html

When page be open type your numbers and click ENTER button on your keyboard. You will see result.

Answer 2

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.