def METHOD_NAME(array, score):
    """Get a school score's percentile rank from an array of cohort scores."""
    true_false_array = [value <= score for value in array]
    if len(true_false_array) == 0:
        return
    raw_rank = float(sum(true_false_array)) / len(true_false_array)
    return int(round(raw_rank * 100))