GSEB Solutions for Class 9 Mathematics – Statistics (English Medium)
GSEB SolutionsMathsScience
Exercise – 16
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Solution 14(1):
a. primary
Data is collected by the investigator himself or herself and hence it is primary data.
Solution 14(2):
b. secondary data
Data is collected from the records stored in a library and hence it is secondary data.
Solution 14(3):
b. secondary data
Data is collected from sources like print media and hence it is secondary data.
Solution 14(4):
b. secondary data
Data is collected from a company report and hence it is secondary data.
Solution 14(5):
b. 38
Maximum marks = 49
Minimum marks = 11
Thus, Range = 49 – 11 = 38
Solution 14(6):
Solution 14(7):
b. 50
50 is the upper limit of the class 41 – 50.
Solution 14(8):
d. 20
20 is the lower limit of the class 20 – 29.
Solution 14(9):
d. 4
The observation 7 occurs four times in the given data and hence its frequency is 4.
Solution 14(10):
c. 20 – 30
The observation 20 will be included in the class 20 – 30.
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Solution 14(15):
d. 15
Class width = Upper limit – Lower limit = 45 – 30 = 15
Solution 14(16):
b. 5
Class width = Upper limit – Lower limit = 60.5 – 55.5 = 5
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c. 8
8 occurs maximum number of times, i.e. three times, and hence, the mode is 8.
Solution 14(26):
d. 9000
If each worker has a salary of Rs. 9000, then the mean, median and mode of the data will be same, i.e. 9000.
Solution 14(27):
d. 2 and 3
Observations 2 and 3 occur two times each. Hence, the modes are 2 and 3.
Solution 14(28):
d. 7, 13, 15
Observations 7, 13 and 15 occur three times each. Hence, the modes are 7, 13, and 15.
Solution 14(29):
d. multimodal
Since the data has three modes, it is multimodal data.
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Exercise – 16.1
Solution 1:
- Number of students in the class – Primary data
- Election results obtained from print media or television news channels – Secondary data
- Literacy rate figures obtained from educational survey – Secondary data
- Number of trees in the school campus – Primary data
- Amount of telephone bills of our home for last one year – Primary data
- Profit or loss of any company obtained from its annual report – Secondary dat
Exercise – 16.2
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Exercise – 16.3
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The bar diagram is as follows:
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The bar diagram is as follows:
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The bar diagram is as follows:
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The bar diagram is as follows:
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The histogram is as follows:
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