Скачать или смотреть MCQ of Statistics Class 9 | Quiz#2 | statistics mcq class 9 | class 9 maths ch 14

MCQ of Statistics Class 9 | Quiz#2 | statistics mcq class 9 | class 9 maths ch 14

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Topic Covered:

1. Tally marks are used to find
(a) class intervals
(b) range
(c) upper limits
(d) frequency
2. In a morning walk, I took 20 rounds of a park. During this period I came across person A, person B, person C and person D, 11 times, 7 times, 10 times and 5 times respectively. I want to represent this data graphically. Which of the following is the best representation?
(a) Bar graph
(b) Histogram with unequal widths
(c) Histogram with equal widths
(d) Frequency polygon
3. For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissa are respectively, the
(a) upper limits of the classes
(b) lower limits of the classes
(c) class marks of the classes
(d) upper limits of preceding classes
4. In a frequency distribution, the mid-value of a class is 10 and width of each class is 6. The upper limit of the class is
(a) 13
(b) 7
(c) 8
(d) 12
5. The mid-value of a class interval is 25 and the class size is 8. The class interval is
(a) 37 - 45
(b) 21 - 29
(c) 36.5 - 44.5
(d) 36.5 - 46.5
6. The mean of the marks scored by 40 students was found to be 35. Later on it was discovered that a score of 43 was misread as 34. The correct mean is
(a) 35.2
(b) 39.4
(c) 39.8
(d) 39.2
7. There are 50 numbers. Each number is subtracted from 43 and the mean of the numbers so obtained is found to be 5. The mean of the given numbers is
(a) 38
(b) 39
(c) 48
(d) 49
8. Mode of the data 15, 14, 71, 15, 91, 2, 51, 19, 41, 51, 18, 15, 51 is
(a) 51
(b) 15
(c) 16
(d) 17
9. The median of the numbers 9, 5, 7, 17, 13, 18, 13, 9,5 , 17, 13, 12, 17 is
(a) 7
(b) 9
(c) 13
(d) 15
10. The median of the numbers 45, 34, 65, 48, 93, 54, 22,86, 45, 87, is
(a) 51
(b) 49.5
(c) 54
(d) 56
11. The mean of 90 items was found to be 45. Later on it was discovered that two items were misread as 26 and 19 instead of 62 and 09 respectively. The correct
mean is
(a) 49.0
(b) 45.0
(c) 45.3
(d) 49.3
12. The mean of 53 observations is 36. Out of these observations, the mean of first 27 observations is 32 and that of the last 27 observations is 40. The 27th observation is
(a) 23
(b) 36
(c) 38
(d) 40
13. The mean of eight numbers is 40. If one number is excluded, their mean becomes 30. The excluded number is
(a) 30
(b) 130
(c) 110
(d) 138