Diketahui data umur anak uia ekolah di uatu dea: 12, 7, 8, 15, 10, 7, 18, 14, 12, 8, 13, 6, 9, 17, 11, 8, 17, 6, 13, 9, 15, 10, 12, 16, 12, 9, 16, 9, 17, 10, 19, 11, 13, 9, 13, 12, 15, 11, 16, 12. Jika log 40 = 1,602, maka kela pertama dari data di ata adalah ….