Java Lambda Expression Help

Been stuck for a week now can't figure out a way. Tried using reduce but did not work.

FuncQ Class In class Fung, given the following code: public static int doOper (Functionoper, Integer[] avals) { return oper.apply(aVals); } public static void main(String[] args) { Integer[] avals = {2, 7, 10, 1); System.out.printf("The first value is %d ", dooperigetFirst, aVals)); System.out.printf("The Last value is %d ", dooperigetLast, aVals)); System.out.printf("The Average value is %d ", doOpergetAverage, aVals)); 1 Write appropriate Lambda definitions for getFirst, getLast, and getAverage