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Class Interval f LCB cf 30 47-53 2 46.5 40-46 2 39.5 28 ол | 33-39 5 32.5 26 26-32 9 25.5 21 Note that the 7th to 12th data belong to this class interval. So, the 7.5th data is also within this class interval. 19-25 6 18.5 12 12-18 6 11.5 6 Therefore, Qı belongs to the class interval 19-25. 2. Compute Qı using the formula: SkN cf, 4 Ok LB + i far a) identify the given: k = 1 (first quartile) N = 30 i = (25 – 19) + 1 = 7 19-25 6 18.5 12 1 af 6-2.1 - ...
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