(Situation K) Foreign Exchange Rates, the Values of Foreign Currency

(Situation K) Foreign Exchange rates, the values of foreign currency in U.S. dollars, are important to investors and international travelers. The table lists the monthly foreign exchange rates of the British pound (in U.S. dollars per pound) for a certain year.
$$\begin{array} { l l } \underline {\text { Month }} & \underline { \text { Exchange Rate } } \\\text { January } & 1.13 \\\text { February } & 1.10 \\\text { March } & 1.13 \\\text { April } & 1.23 \\\text { May } & 1.25 \\\text { June } & 1.28 \\\text { July } & 1.38 \\\text { August } & 1.39 \\\text { September } & 1.36 \\\text { October } & 1.42 \\\text { November } & 1.44 \\\text { December } & 1.44\end{array}$$
-Calculate the value of the exponentially smoothed series for April using a smoothing constant of $w = 0.7$