### Math 10 Chapter 4 - Part C 1. The standard deviation is the positive square root of arithmetic mean a) False b) True 2. In a series 0,1,4,6,7,9,12 the median is 6. a) True b) False 3. In series 7,7,7,7,7 the dispersion is zero. a) False b) True 4. In X = (åfx/åf) 'f' stands for average a) True b) False 5. The group which contains maximum frequency can be selected as model group a) True b) False 6. The class mark of interval (34-38) is36. a) False b) True 7. For a data containing even member of items | n | the median is calculated as the average of (n+1/2) the items a) False b) True 8. Arithmetic mean is highly effected by extreme values. a) True b) False 9. Classification of data by two characteristics at the same time is called one way tabulation. a) False b) True 10. Arithmetic mean is the most simple form of an average. a) True b) False 11. The numerical figures obtained from any field of study are known as a value a) Value b) Variable c) Constant d) Data 12. A person who collects the data is known as a) Principal b) Investigator c) Teacher d) Student 13. The data directly collected from its source is called ________ data a) Secondary b) Primary c) Exact d) Medium 14. If there are some specific values that a variable can take, we call such variable a a) Integral variable b) Discrete c) None of the above d) Random 15. Any characteristic whose values are always different from one individual to another is called a) Variable b) Primary Data c) Constant d) Discrete variable 16. Any fixed quantity that has single value is known as _________ a) Value b) Variable c) Data d) Constant 17. A variable that can take all possible values in a given interval is called a ________ a) Continuous variable b) Binary variable c) None of them d) Both a & b 18. Numerical facts obtained on the first hand and recorded as they stand are called ____ data a) Continuous b) Un grouped c) Variable d) Discontinuous 19. The process of arranging the data into certain groups or classes having similar characteristics is known as a) Data b) Classification c) Secondary data d) Observations 20. The difference between the upper and lower limit of any two consecutive class intervals is called a) Class boundary b) Class Limit c) Class interval size d) Classification

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