CBSE Board Practice

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CBSE Grade IX - Statistics

Question 1

1.	The observations of an ungrouped data are x 1 , x 2 , x 3 and x 1 < x 2 < x 3 . If the mean and median of the data are 60 and 40 respectively and x 3 - x 1 = 100 , find x 1 , x 2 , x 3
	22 , 40 , 122 40 , 40 , 240 24 , 40 , 124 20 , 40 , 120

Question 2

2.	Construct a frequency table in exclusive form for the following ages (in years) of 16 students, taking class size 4 . 24 18 17 10 23 16 23 24 16 22 15 18 14 15 19 22
	Age (in years) 10 - 14 14 - 18 18 - 22 22 - 26 No. of Students 1 6 3 6 Age (in years) 10 - 14 14 - 18 18 - 22 22 - 26 No. of Students 1 6 5 6 Age (in years) 10 - 14 14 - 18 18 - 22 22 - 26 No. of Students 1 10 3 6 Age (in years) 10 - 14 14 - 18 18 - 22 22 - 26 No. of Students 1 3 6 6 Age (in years) 10 - 14 14 - 18 18 - 22 22 - 26 No. of Students 6 6 3 1

Question 3

3.	The class size used in the below table is Class-Interval 40 - 50 51 - 61 62 - 72 73 - 83 84 - 94 95 - 105 106 - 116 Frequency 26 29 16 13 8 27 19
	14 10 11 12 9

Question 4

4.	There are 1008 creatures in a zoo as shown in the bar graph. Identify the table for the given bar diagram.
	Type of Creatures Domestic animals Reptiles Birds Beast animals Wild animals No. of Creatures 198 153 306 288 63 Type of Creatures Domestic animals Reptiles Birds Beast animals Wild animals No. of Creatures 63 198 153 288 306 Type of Creatures Domestic animals Reptiles Birds Beast animals Wild animals No. of Creatures 198 288 63 306 153 Type of Creatures Domestic animals Reptiles Birds Beast animals Wild animals No. of Creatures 288 306 63 153 198 Type of Creatures Domestic animals Reptiles Birds Beast animals Wild animals No. of Creatures 198 63 288 306 153

Question 5

5.	The marks obtained by Srikanth in his annual exam are shown below. Find the subject that has maximum score.
	English Physics Biology Social Studies Science

Question 6

6.	Rainfall of 16 days (in mm) are given below. Find the mode rainfall. 15 8 5 11 6 5 15 5 12 11 14 15 14 10 6 5
	7 mm 4 mm 6 mm 3 mm 5 mm

Question 7

7.	The number of bars present in the bar chart of the following table is
	7 2 6 4 5

Question 8

8.	Heights of 21 students are given below. Find the mode. Height (in cm) 127 134 136 138 143 153 155 157 162 No. of students 2 2 4 3 3 2 3 1 1
	136 cm 137 cm 138 cm 134 cm 135 cm

Question 9

9.	The arithmetic mean of 17 37 18 35 10 is
	21.4 24.4 22.4 23.4 25.4

Question 10

10.	The scores obtained by 14 students in a test are given below. Find the mean score. 11 20 4 17 10 6 4 10 13 17 10 15 2 7
	18 2 20 10 10 3 7

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