Write a function named is_sorted that accepts a list of real numbers as a parameter and returns True if the list is in sorted (nondecreasing) order and False otherwise. For example, if lists named list1 and list2 store [16.1, 12.3, 22.2, 14.4] and [1.5, 4.3, 7.0, 19.5, 25.1, 46.2] respectively, the calls is_sorted(list1) and is_sorted(list2) should return False and True respectively. Assume the list has at least one element. A one-element list is considered to be sorted.