A list consists of heterogeneous elements: numbers, strings, and symbols as in the following example: (a 1 b 2 'c 'd 3 4 'e “f” 5). (a) Write a Scheme function mean (either recursive or iterative) that computes the mean value of the numbers in the list, as in the following example: (define lst '('a 1 'b 2 'c 'd 3 4 'e “f” 5 “6”)) (mean lst) (b) Write a Scheme function meanlist that computes the mean of numbers that are listed after the meanlist operator, as in the following example: (meanlist 'a 1 'b 2 'c 'd 3 4 'e “f” 5 “6”)

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