# statistics/mean and standard deviation

posted by
**mary- please check calculations.** on
.

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