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.

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