Statistics — practice questions, page 8
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QuestionGroup P has 40 values with mean 50 and SD 6; group Q has 60 values with mean 60 and SD 8. What is…QuestionTwenty-five values have mean 40 and SD 5. It is later found that a value recorded as 52 should…QuestionA data set has a coefficient of variation of 25%. When 10 is added to every value, the coefficient…QuestionEighteen observations have mean 7 and standard deviation 4. The observation 12 is then deleted.…QuestionTen observations have variance 9. Each is multiplied by 2 and then 3 is added; after that, one…QuestionFor n observations, Σ(x − 5) = 20 and Σ(x − 5)² = 160, and their mean is 6. Find n and the variance.QuestionTwo numbers have mean 9 and standard deviation 3. A third number, 15, is added to them. Find the…
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