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CBSE Class 9 Mathematics Worksheet

Unit 6-Statistics and Probability - Statistics

1.
Fill in the blanks: If each observation of the data is increased by 4, then their mean _________.
A) remains same B) Becomes 4 times the original mean C) is decreased by 4 D) is increased by 4
2.
Fill in the blanks: Mean of the data 2, 4, 6, 8, 10 is ________.
A) 5 B) 6 C) 10 D) 4
3.
The mean of five numbers is 50. If one number is excluded the mean becomes 60. Find the excluded number.
A) 10 B) 20 C) 30 D) 55
4.
Find the mean of sum of first 20 natural numbers.
A) 12 B) 20 C) 10.5 D) 20.5
5.
Fill in the blanks: Tally marks are used to find _____________
A) Class limit B) Frequency C) Class mark D) None of these
6.
Fill in the blanks: The class mark of the class 100-120 is ________.
A) 100 B) 110 C) 120 D) 105
7.
Find the mode of the data 3, 4, 7, 5, 4, 7, 8, 9, 10, 12, 4, 6, 11.
A) 7 B) 5 C) 3 D) 4
8.
Choose the correct option: 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 upper class-limit of the highest class is ________.
A) 35 B) 15 C) 25 D) 20
9.
The number of goals were scored by a team in a series of 10 matches are 2, 3, 4, 5, 0, 1, 3, 3, 4, 3. Find the mode.
A) 2 B) 5 C) 1 D) 3
10.
For drawing a frequency polygon of a continous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abcissae are respectively.
A) upper limits of the classes B) lower limits of the classes C) class marks of the classes D) None of these
11.
In a hockey match a team score the following number of goals in 10 matches: 4, 5, 8, 5, 7, 8, 9, 8, 8, 7. Find the median.
A) 7.5 B) 8.5 C) 9 D) None of these
12.
6 students devote time in hours per day are 6,8,9,12,10. Find the mean time devoted by them in a day.
A) 8 hours B) 7 hours C) 9 hours D) 10 hours
13.
State True/False: In the class intervals 10-20, 20-30, the number 20 is included in 10-20.
A) True B) False
14.
Find the median of the data 155, 160, 145, 149, 150, 147, 152, 144, 148.
A) 148 B) 150 C) 149 D) 147
15.
State True/False: Statistics is the area of study dealing with the presentation, analysis and interpretation of data.
A) True B) False
16.
The data has been arranged in ascending order: 14, 19, 25, 29, x, 39, 41, 48, 54. If the median of the data is 35. Find x.
A) 34 B) 39 C) 33 D) 35
17.
Choose the correct option: The median of observations 17, 18, 20, 22, x+2, x+4, 31, 35, 37 is found to be 24. If the observations have been arranged in ascending order, the value of x will be ________.
A) 22 B) 30 C) 20 D) 25
18.
State True/False: Mode is the frequently occuring observation.
A) True B) False
19.
The mean of 20, 25, x, 35, 40 is 30. What is the value of x?
20.
Fill in the blanks: The lower limit of the class 50 -75 is ________.
A) 75 B) 50 C) 25 D) None of these

CBSE Class 9 Mathematics Worksheet

Unit 6-Statistics and Probability - Statistics

Answers

1.
Option D
2.
Option B
3.
Option A
4.
Option C
5.
Option B
6.
Option B
7.
Option D
8.
Option A
9.
Option D
10.
Option C
11.
Option A
12.
Option C
13.
Option B
14.
Option C
15.
Option A
16.
Option D
17.
Option A
18.
Option A

19.
30
20.
Option B

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