def featDenorm(featuresNorm, mean, std):
    """Denormalize features by mean and standard deviation

    Args:
        features_norm (np.array): normlized np.array
        mean (float):  average of the array elements
        std (np.array): standard deviation, a measure of the spread of the array elements

    Returns:
        np.array: un normlized np.array
    """
    features = (featuresNorm * std) + mean
    return features