Homework Help: statistics/mean and standard deviation

Posted by mary- please check calculations. on Saturday, October 23, 2010 at 5:32pm.

find the mean and standard deviation in the following probability distribution

x 1 2 3
p(x) 0.2 0.6 0.2

*i think that the mean is 2 but am lost after that when it comes to the standard deviation. please show work and calculations. the more i work with numbers the more confused i get. thank you.
mary hornbeck

statistics/mean and standard deviation - Dick, Friday, November 26, 2010 at 12:36pm
idk

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