CBSE Class 9 Statistics MCQ By Clarify Knowledge

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CBSE Class 9 Statistics MCQ Table

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Question 1.
The class mark of the class 90-130 is:
(a) 90
(b) 105
(c) 115
(d) 110Answer

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Question 2.
The range of the data:
25, 81, 20, 22, 16, 6, 17,15,12, 30, 32, 10, 91, 8, 11, 20 is
(a) 10
(b) 75
(c) 85
(d) 26Answer

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Question 3.
In a frequency distribution, the mid value of a class is 10 and the width of the class is 6. The upper limit of the class is:
(a) 6
(b) 7
(c) 10
(d) 13Answer

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Question 4.
The width of each of five continuous classes in a frequency distribution is 5 and the lower class-limit of the lowest class is 10. The lower class-limit of the highest class is:
(a) 15
(b) 30
(c) 35
(d) 40Answer

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Question 5.
Let m be the mid-point and 1 be the lower class limit of a class in a continuous frequency distribution. The upper class limit of the class is:
(a) 2m + l
(b) 2m – l
(c) m – l
(d) m – 2lAnswer

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Question 6.
The class marks of a frequency distribution are given as follows:
15, 20, 25, …
The class corresponding to the class mark 15 is:
(a) 12.5 – 17.5
(b) 17.5 – 22.5
(c) 18.5 – 21.5
(d) 19.5 – 20.5Answer

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Question 7.
In the class intervals 10-20, 20-30, the number 20 is included in:
(a) 10-20
(b) 20-30
(c) both the intervals
(d) none of these intervalsAnswer

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Question 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 370-390 is:
(a) 0
(b) 1
(c) 3
(d) 5Answer

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Question 9.
A grouped frequency distribution table with classes of equal sizes using 63-72 (72 included) as one of the class is constructed for the following data:
30, 32, 45, 54, 74, 78, 108, 112, 66, 76, 88, 40, 14, 20, 15, 35, 44, 66, 75, 84, 95, 96, 102, 110, 88, 74, 112, 14, 34, 44.
The number of classes in the distribution will be:
(a) 9
(b) 10
(c) 11
(d) 12Answer

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Question 10.
To draw a histogram to represent the following frequency distribution:

the adjusted frequency for the class 25-45 is:
(a) 6
(b) 5
(c) 3
(d) 2Answer

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Question 11.
The mean of five numbers is 30. If one number is excluded, their mean becomes 28. the excluded number is:
(a) 28
(b) 30
(c) 35
(d) 38Answer

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Question 12.
If x¯ represents the mean of n observations x₁, x₂, …, x_n, then value of ∑ni=1(xi−x¯) is:
(a) -1
(b) 0
(c) 1
(d) n – 1Answer

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Question 13.
If each observation of the data is increased by 5, then their mean
(a) remains the same
(b) becomes 5 times the original mean
(c) is decreased by 5
(d) is increased by 5Answer

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Question 14.
Let x¯ be the mean of x₁, x₂, …, x_n and y the mean of y₁, y₂, …, y_n. If z is the mean of x₁, x₂, …. x_n, y₁, y₂, …, y_n, then z is equal to
(a) x¯+y¯
(b) x¯+y¯2
(c) x¯+y¯n
(d) x¯+y¯2nAnswer

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Question 15.
If x¯ is the mean of x₁, x₂, …, x_n, then for a ≠ 0, the mean of ax₁, ax₂, …, ax_n, x1a, x2a, …….., xna is