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.