Expected value of the sum of the absolute value of iid random variables

#1
How do you go about finding the expected value of the sum(abs(X_i)), i=1,...,n? The X_i are iid Normal with mean 0 and variance theta.
 

Dason

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#2
Can you find the expected value of the absolute value of a single normal random variable?

It's not to bad to evaluate the necessary integral.