6. Following are the marks obtained by 10 students in a class in two tests : Students A B D E F G H J Test 1 70 68 67 55 60 60 75 63 60 72 Test 2 65 65 80 60 68 58 75 63 60 70 Calculate the rank correlation cocllicient between the marks of two tests. (i) 60 is repeated 3 times in test 1 (ii) 60,65 is repeated twice in test 2.

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