Statistics Class 9 Worksheets

# Statistics Class 9 Worksheets

Statistics Class 9 Worksheet helps to check the understanding of the students of grade 9.

## Statistics Class 9 Worksheet with Answers

1. For which value of x is the mode of the following data is 17?

15, 16, 17, 14, 17, 16, 13, x, 17, 16, 15, 15

2. Find the median of first sixteen odd numbers.

3. Find the median of first ten prime numbers.

4. A school has two sections. The mean mark of one section of size 40 is 60 and mean mark of other section of size 60 is 80. Find the combined mean of all the students of the school.

5. The median of the following observations arranged in ascending order 8, 9, 12, 18, (x + 2), (x + 4), 30, 31, 34, 39 is 24. Find x.

6. The mean weight of 180 students in a school is 50 kg. The mean weight of boys is 60 kg and the mean weight of the girls is 45 kg. Find the number of the boys and the number of girls in the school.

7. The marks secured by 15 students are 70, 55, 95, 62, 82, 65, 60, 68, 75, 58, 64, 85, 80, 90, 51. Find the median marks.

8. If the mean of 2x + 3, 3x + 4, x + 7, x – 3, 4x – 7 is 14. Find the value of x.

9. The mean of 8 numbers is 15. If each number is multiplied by 2, what will be the new mean?

10. Find the median of the following data: 33, 31, 48, 45, 41, 92, 78, 51 and 61. If 92 is replaced by 29, what will be the new median?

11. The mean of 9 numbers is 50. If one number is included, their mean becomes 55. Find the included number.

12. Find the median of the following data: 15, 28, 72, 56, 44, 32, 31, 43 and 51. If 32 is replaced by 23, find the new median.

13. Draw a histogram of the following data.

 Class 10-20 20-30 30-40 40-50 50-60 60-70 Frequency 5 10 15 10 5 5

14. Thirty children spent about the number of hours they watched TV programmes in the previous week. The result was as follow:

2             1               10                  4                  8                 10

10           5                2                   8                  9                  8

4             3                5                   6                  1                  4

6             8                2                   5                  8                  8

3             9                3                  10                 4                  6

(a) Prepare a frequency table for the given data.

(b) Find the mode of the data.

15. The daily minimum questions solved by a student during a week were as under:

 Monday Tuesday Wednesday Thursday Friday Saturday 30 35 40 36 28 37

Find the mean questions.

16. The blood groups of 30 students of Class VIII are recorded as follows:

B, A, O, O, AB, O, A, O, B, A, O, B, A, O, O, A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O.

Represent this data in the form of a frequency distribution table.

Which is the most common and which is the rarest blood group among these students?

17. Say the statement are true or false.

Two sections of Class XII having 30 students each appeared for Science Olympiad. The marks obtained by them are shown below:

46 31 74 68 42 54 14 61 83 48 37 26 8 64 57

93 72 53 59 38 16 88 75 56 46 66 45 61 54 27

27 44 63 58 43 81 64 67 36 49 50 76 38 47 55

77 62 53 40 71 60 58 45 42 34 46 40 59 42 29

Student having Marks above 80 are exceptional. Student obtaining below 30 marks are failed.

(a) The number of students who scored more than 89 marks is 2.

(b) The number of students who scored marks between 50-69 is 22.

(c) The number of students who scored more than 49 marks is 32.

(d) The range of the marks is 85.

(e) The number of exceptional students is 4.

(f) Students who failed in the test are 7.

18. A family with a monthly income of  20,000 had planned the following expenditure per month under various heads.

 Heads Expenditure (in thousand rupees) Grocery 5 Medicine 4 Fuel 2 Education 5 Entertainment 2 Rent 1 Miscellaneous 1

Draw the bar graph for the above data.

19. Draw a bar graph of the following data.

 Product A B C D E F Number of consumers 150 130 180 160 120 150

1. 17              2. 16

3. 12              4. 72

5. 21

6. 60 boys; 120 girls

7. 68                8. 6

9. 30               10. 48; 45

11. 100           12. 43, 43

13. Do it yourself

14. b. 8

15. 34.33

16. Most common-O; Rarest-AB

17. a. False          b. True

c. False           d. True

e. True            f. True

18. Do it yourself

19. Do it yourself

 Maths Worksheets for Other Chapters of Class 9

 Maths Worksheets for Other Classes

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