Question: what is the function standardize_tibble() that loops through the columns of a tibble and standardizes each with your standardize() function. ( Hints : If tt

what is the function standardize_tibble() that loops through the columns of a tibble and standardizes each with your standardize() function. (Hints: If tt is a tibble, ncol(tt) is the number of columns, and 1:ncol(tt) is an appropriate index set. If tt is a tibble, tt[[1]] is the first column.)

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