5.9. Samples of 39 articles each, from an optical company, were examined for breakage. Forty-three such samples over two months time yielded d¼2, 1, 1, 0, 2, 3, 2, 1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, 0, 1, 0, 2, 0, 1, 1, 0, 1, 0, 7, 10, 6, 1, 2, 2, 2, 1, 1, 0, 2, 2, 2, 5, 2. Analyze by an appropriate control chart. Would you prefer a p or an np chart? Why? If these samples are in fact lots, can you think of any practical reason for the size 39?