Posted by **Heather** on Monday, March 14, 2011 at 3:25pm.

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

- Math (Statistics) -
**MathGuru**, Wednesday, March 16, 2011 at 8:00pm
Formula for the mean:

SUM [x * P(x)]

Take x times P(x) for each value listed. Then add for the mean.

Formula for the variance:

{SUM [x^2 * P(x)] - mean^2}

Square each x. Then take x^2 times P(x) for each value. Add up the values for a total, then subtract mean squared from that total.

For standard deviation:

Take the square root of the variance.

I hope this will help.

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