This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Range
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Step 1: Answer Question 1. The range is the difference between the highest and lowest values in a dataset, making it the simplest measure of variability to calculate. 1. What measure of variability is considered as the simplest to calculate? Answer:
Step 2: Answer Question 2. The range is calculated by subtracting the lowest score from the highest score. The given scores are: 12, 13, 8, 19, 21, 9.
Step 3: Answer Question 3. We know that . Given:
Step 4: Answer Question 4. We know that . Given:
Step 5: Answer Question 5. We need to find the highest score for each group using the formula: . For Group A:
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Answer Question 1. The range is the difference between the highest and lowest values in a dataset, making it the simplest measure of variability to calculate.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.