... [5], [6] top-level variable, [2], [3], [4], [5] definition window, [2], [3], [4], [5], [6], [7], [8], [9], [10 ], [11 ], [12 ], [13 ], [14 ], [15 ], [16 ], [17 ], [18 ], [19 ], [20], [ 21] , [22], [23], ... as (list 1. 10 1. 12 1. 08 1. 09 1. 11) and produces (list 1. 10 329/300 82/75) in return. Develop the function vector-3-averages, which computes the 3-item sliding averages of a vector of numbers. ... ``smoothing.'' Suppose we have weekly prices for some basket of groceries: 1. 10 1. 12 1. 08 1. 09 1. 11 Computing the corresponding three-item average time series proceeds as follows:...