Standard devviation question, please HELP?

If X~N(10, 3^2), then the standard deviation equals





a) 10


b) 9


c) 3


d) 1

Standard devviation question, please HELP?
When a normal variable is quoted as N(m,s^2) then the first figure is the mean and the second is the variance usually given as standard deviation squared. You should now be able to work out the answer yourself.
Reply:c)3





X~Normal(Mean, Variance)





Variance=Standard Deviation ^2