试图将数组传递给方法，但抛出不兼容的类型错误？

I'm trying to design a program that creates an array and then populates it in one method, calculates the average in another method and then will print its contents and the average in the main method. However I get an incompatible type error when trying to pass the array to the calAverage method and do not understand why. I'm trying to design a program that creates an