Question

Let x n (, ), where r d and r dd is a positive definite matrix. Write the expression for the density of x. Prove that e[(x )(x ) >] = . (hint: show that can be decomposed as = ll>, and consider z = l 1 (x ) and use the change of variable rule to write the density of z. Compute e[(x )(x ) >] using z.)

Answer 1

CP. 100. (100-25)=75

Profit 15. 75*32/100=24

SP. 115. 99

Difference between old and new SP, 115-99=16

Since, difference= 600

Therefore. 16=600

Now to calculate CP,

(16/100)=(600/CP)

CP= 3750