Suppose that X1, . .., Xn are i.i.d with density f (x) = - 1 B ex/P, x >0, B20. a) Determine the cumulant generating function for a single observation of X. Kx(t) = - log(1 - Bt) O Kx(t) = exp(1 - Bt) O Kx (t) = B t - B O Kx (t) = 1 1 - Bt O Kx(t) = exp(1 - Bt)