Suppose that a random variableYhas pdf:

f(y;a;b)=aby^(b-1)e^(-ay^(b))

a) Find the maximum likelihood estimator foraassuming thatbis known.

b) Supposeaandbare both unknown. Explain how you would work out the two maximum likelihood estimators ofaandb.

I honestly have no idea how to solve this... i have tried googling it but it wasnt not very helpfull.

any help would be really appreciated.

thanks