how do I find the mean, variance and standard deviation of this?

how do I find the mean, variance and standard deviation of this?

This answer isn't working. I am getting unable to match errors with no help on this error available when I click through Maple. Are there any other suggestions available?

This answer isn't working. I am getting unable to match errors with no help on this error available when I click through Maple. Are there any other suggestions available?

P(|Z|>1.39), Z is N(0,1)   How would I type commands into Maple for this? THanks again!

P(|Z|>1.39), Z is N(0,1)   How would I type commands into Maple for this? THanks again!