STATISTICS  Class IX
Quiz 1 Compiled by Mrs. Pintu Prasad
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1.The class mark of the class 90-120 is
2 points
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2. The range of the data :25, 18, 20, 22, 16, 6, 17, 15, 12, 30, 32, 10, 19, 8, 11, 20 is
2 points
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3. In a frequency distribution, the mid value of a class is 10 and the width of the class is 6. The lower limit of the class is
2 points
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4. The width of each of five continuous classes in a frequency distribution is 5 and thelower class-limit of the lowest class is 10. The upper class-limit of the highest class is
2 points
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5. Let m be the mid-point and l be the upper class limit of a class in a continuous frequency distribution. The lower class limit of the class is
2 points
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6. The class marks of a frequency distribution are given as follows :15, 20, 25, ...The class corresponding to the class mark 20 is
2 points
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7. In the class intervals 10-20, 20-30, the number 20 is included in
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8. A grouped frequency table with class intervals of equal sizes using 250-270(270 not included in this interval) as one of the class interval is constructed for the following data :268, 220, 368, 258, 242, 310, 272, 342,310, 290, 300, 320, 319, 304, 402, 318,406, 292, 354, 278, 210, 240, 330, 316,406, 215, 258, 236.The frequency of the class 310-330 is
2 points
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9. . The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is
2 points
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10.If the mean of the observations :x, x + 3, x + 5, x + 7, x + 10 is 9, the mean of the last three observations is
2 points
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