Find the limiting distribution of $Z_n=n[1-F(Y_n)]$ Let $Y_n$ denote the maximum (the last order statistic) of a random sample of size $n$ from a distribution of the continuous type that has c.d.f $F(x)$ and pdf $f(x) = F'(x)$. Find the limiting distribution of $Z_n=n[1-F(Y_n)]$
I dont have the solution to this but the answer my teacher gave us is that the limiting distribution of $Z_n$ should be exponential with mean $1$. If you define $Z_n=n[1-Y_n]$ then that limiting distribution is exponential with mean $1$ but I dont know how to work with $F(Y_n)$

I'm going to denote your "maximum" $Y_n$ as $Y_{(n)}$. Observe that 
\begin{align*}
F_{Z_n}(z) &= P(Z_n \le z) \\
&= P([1 - F_{}(Y_{(n)})] \le z/n ) \\
&= P (F_{}(Y_{(n)}) \ge 1-z/n) \\
&= P(Y_{(n)} \ge F^{-1}(1-z/n)) \\
&= 1- P(Y_{(n)} \le F^{-1}(1-z/n)) \quad \text{(continuous dist.)} \\
\end{align*}
Suppose our random sample was $Y_1,\dots,Y_n$ from a distribution with cdf $F$. Then
$$
P(Y_{(n)} \le c) = P((Y_1 \le c) \ \cap \cdots \cap (Y_n \le c)) \stackrel{ind.}{=} P(Y_1 \le c) \cdots P(Y_n \le c) \stackrel{i.d.}{=} [P(Y_1 \le c)]^n = [F(c)]^n
$$
Returning and using this in the main problem, we have
$$
F_{Z_n}(z) = 1 - [F \left( F^{-1}(1-z/n) \right)]^n = 1- [1-z/n]^n  \xrightarrow{n \to \infty} 1- e^{- z}.
$$
which we recognize as Exponential rate $=1$.
