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प्रश्न
What is primary data?
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उत्तर
The word data means information statistical data and of two types
(i) Primary data, (ii) Secondary data
Primary data: when an investigator collects data himself with a definite plan or design in his (her) mind is called primary data
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संबंधित प्रश्न
Describe some fundamental characteristics of statistics.
Explain the meaning of the term Class limits.
Define cumulative frequency distribution.
Explain the difference between a frequency distribution and a cumulative frequency distribution.
In a class test, 50 students obtained marks as follows:
| Marks obtained |
0 – 20 | 20 – 40 | 40 – 60 | 60 – 80 | 80 – 100 |
| Number of students |
4 | 6 | 25 | 10 | 5 |
Find the modal class and the median class.
In a frequency distribution table with 12 classes, the class-width is 2.5 and the lowest class boundary is 8.1, then what is the upper class boundary of the highest class?
The monthly income of 100 families are given as below :
| Income in ( in ₹) | Number of families |
| 0-5000 | 8 |
| 5000-10000 | 26 |
| 10000-15000 | 41 |
| 15000-20000 | 16 |
| 20000-25000 | 3 |
| 25000-30000 | 3 |
| 30000-35000 | 2 |
| 35000-40000 | 1 |
Calculate the modal income.
Which of the following is not a measure of central tendency?
Explain the meaning of the following terms: Class mark
The times, in seconds, taken by 150 athletes to run a 110 m hurdle race are tabulated below:
| Class | Frequency |
| 13.8 - 14 | 3 |
| 14 - 14.2 | 4 |
| 14.2 - 14.4 | 6 |
| 14.4 - 14.6 | 69 |
| 14.6 - 14.8 | 48 |
| 14.8 - 15.0 | 20 |
The number of athletes who completed the race in less than 14.6 seconds is?
