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The following table shows the distribution of student heights obtained for certain college: Height (inches) Frequency 69 - 71
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Given that :- Height f IX I xf midpoint x²f 69-71.9 72-74.9 75-779 78-80.9 81-83. 9 TOTAL 21 70.45 1479.45 1 16 73.45 1175.25= 5x2f_()2 = 13.3519 o = 3.654 Coefficient of variation (r), - X 3.654 75.25 V= 10.0486 In % format V= 4.86 %

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