A qualitative variable with three classes (X, Y, and Z) is measured for each 20 units randomly sampled from a target population. The data (Observed class for each unit) are listed below. _______________________________________   Y  X  X  Z  X  Y  Y  Y  X  X  Z  X Y  Y  X  Z  Y  Y  Y  X _______________________________________   A. Compute the frequency for each of the three classes.   Class Frequency X   Y   Z   Total

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