Write a method named mean that accepts as a parameter an ArrayList of real numbers, and returns the arithmetic mean (average) of the integers in the list as a real number. For example, if the list...

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Extracted text: Write a method named mean that accepts as a parameter an ArrayList of real numbers, and returns the arithmetic mean (average) of the integers in the list as a real number. For example, if the list passed contains {2.0, 4.5, 6.5, 1.Ø}, your method should return 3.5. If the list is empty, return Ø.0. Do not modify the list that is passed in.