
    Develop a function for an automated writing assessment system that standardizes all numerical feedback metrics within grouped student evaluation data by converting eligible values to decimal numbers, enabling consistent score analysis and comparison across different assessment criteria. The function should process nested lists of student performance indicators, where each inner list contains various assessment metrics (such as grammar scores, word counts, and readability indices) that may be stored as different data types. The system must maintain non-convertible feedback elements while transforming all possible numerical values to standardized floating-point format.
    

    
def list_to_float(test_list):
    """
    Develop a function for an automated writing assessment system that standardizes all numerical feedback metrics within grouped student evaluation data by converting eligible values to decimal numbers, enabling consistent score analysis and comparison across different assessment criteria. The function should process nested lists of student performance indicators, where each inner list contains various assessment metrics (such as grammar scores, word counts, and readability indices) that may be stored as different data types. The system must maintain non-convertible feedback elements while transforming all possible numerical values to standardized floating-point format.
    

    """
def list_to_float(test_list):
    """
    Develop a function for an automated writing assessment system that standardizes all numerical feedback metrics within grouped student evaluation data by converting eligible values to decimal numbers, enabling consistent score analysis and comparison across different assessment criteria. The function should process nested lists of student performance indicators, where each inner list contains various assessment metrics (such as grammar scores, word counts, and readability indices) that may be stored as different data types. The system must maintain non-convertible feedback elements while transforming all possible numerical values to standardized floating-point format.
    

    """
    res = []
    for tup in test_list:
        temp = []
        for ele in tup:
            if ele.isalpha():
                temp.append(ele)
            else:
                temp.append(float(ele))
        res.append((temp[0], temp[1]))
    return res