Paul Gibson Online Maths Tutor
  • A level Maths tutor
  • Online Tuition
  • Exams & Revision
  • Contact & Fees
  • A-level Video Tutorials

​I cannot see any way of avoiding integration.
By integration it turns out that, for N(0,1) and x>0, 
$$ E(X) = \frac{\sigma^2}{\sqrt 2\pi}$$ 

Powered by Create your own unique website with customizable templates.
  • A level Maths tutor
  • Online Tuition
  • Exams & Revision
  • Contact & Fees
  • A-level Video Tutorials