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Questions:

1. Statistics is the science of counting. Explain.
2. Mean of 100 items is found to be 30. If at the time of calculation, two items are wrongly taken as 32 and 12 instead of 23 and 11, find the correct mean.
3. Calculate the range and its coefficient from the following data: 20, 8, 0, -30, -5, 4.
4. Give the meaning and definition of classification.
5. Explain various mathematical properties of standard deviation.
6. Discuss the merits and demerits of Karl Pearson's coefficient of correlation.
7. What is the chance of throwing a total of 5 or 11 with two dice?
8. If the arithmetic mean of the following frequency distribution is 39.25, find the missing term.
9. Calculate standard deviation and coefficient of variation from the given data.
10. What do you understand by graphical presentation? Describe its advantages, disadvantages and various forms.
11. From the given data, obtain the two regression equations.
12. What is Spearman's rank correlation? Bring out its usefulness. How does the coefficient differ from Karl Pearson's coefficient of correlation?
13. What is an index number? Explain the terms price relative, quantity relative and value relative. Discuss in brief the uses of an index number.