Posted by **Anonymous** on Sunday, October 7, 2012 at 9:47am.

. Find the mean and standard deviation of the following probability distribution:

x 1 2 3

P(x) 0.4 0.25 0.35

Please show all of your work.

- stats -
**MathGuru**, Monday, October 8, 2012 at 5:49pm
To find the mean:

SUM [x * P(x)]

Multiply each x by its respective probability P(x). Add together for a total. This will be your mean.

To find variance:

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

Square each x. Multiply each squared x by its respective probability P(x). Add together for a total. Square the mean. Subtract the squared mean from the total. This will be your variance.

To find standard deviation:

Take the square root of the variance.

Hopefully, this information will help you with problems of this type.

**Answer this Question**

**Related Questions**

- statistics/mean and standard deviation - find the mean and standard deviation in...
- Stats - Given the following frequency distribution, find the mean, variance, and...
- Stats.....plz help me..... - Given the following frequency distribution, find ...
- Stats - Find the mean and standard deviation of the following probability ...
- Please tell me if i did this correct - Given the following frequency ...
- stats please help ASAP!!! - A. The GPAs of all 5540 students enrolled at a ...
- prob and stats - 11. Assume that the population of heights of male college ...
- Statics - Given the following frequency distribution, find the mean, variance, ...
- Math- Statistics - A random sample of size 36 is to be selected from a ...
- Stats - You take and SRS of size 25 from a population with mean 200 and standard...