The ranks of the same 15 students in two subjects A and B are given helow; the two Tiumbers within the brackets denoting the ranks of the same student in A and B respectively. (1, 10), (2, 7). (3, 2), (4, 6), (5, 4), (6, 8), (7, 3), (8, 1), (9, 11), (10, 15), (11, 9), (12, 5), (13, 14), (14, 12), (15, 13). Use Spearman's formula to find the rank correlation coefficient.

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