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The two common measures of dispersion are range and:

AStandard derivation
BStandard declination
CStandard delegation
DStandard deviation
Answer & Solution
Correct answer: D. Standard deviation
1. Two measures of variability are named together. 2. One of them is the range. 3. Common measures of dispersion are Range and Standard Deviation. 4. So the answer is standard deviation. _Source: syllabus Computer Science, Ch 7 'Understanding Data'_
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