from typing import List


def drop_lowest(grades: List[float]) -> List[float]:
    """Drops the lowest number and returns the pruned collection

    Args:
        grades (List[float]): An array of number grades

    Returns:
        List[float]: The pruned list of grades
    """
    new_grades = grades.copy()
    new_grades.remove(min(new_grades))

    print(new_grades)

    return new_grades