Find the 3rd moment of X about mean

..this will b zero bcoz normal distribution is symmetric (odd moments of symmetric distributions about mean is 0)

so E(X-u)^3 =0

E(X^3)= u^3 +3*u*E(X^2)-3*u^2*E(X)

put the values of E(X^2) and E(X) nd get the ans

Akshay Jain

Masters in Economics

Delhi School of Economics

2013-15