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प्रश्न
Which of the two – the primary or the secondary data – is more reliable and why?
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उत्तर
The word data means information statistical data and of two types
(i) Primary data, (ii) Secondary data
Primary data are reliable and relevant because they are original in character and are collected by some individuals or by research bodies.
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संबंधित प्रश्न
Describe some fundamental characteristics of statistics.
Find the mean, median and mode of the following data:
| Class | 0 – 10 | 10 – 20 | 20 – 30 | 30 – 40 | 40 – 50 | 50 – 60 | 60 – 70 |
| Frequency | 4 | 4 | 7 | 10 | 12 | 8 | 5 |
A survey regarding the heights (in cm) of 50 girls of a class was conducted and the following data was obtained:
| Height (in cm) | 120 – 130 | 130 – 140 | 140 – 150 | 150 – 160 | 160 – 170 | Total |
| No. of girls | 2 | 8 | 12 | 20 | 8 | 50 |
Find the mean, median and mode of the above data.
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.
Explain the meaning of the following terms: Variate
Explain the meaning of the following terms: Class mark
Explain the meaning of the following terms: True Class Limits
The times, in seconds, taken by 150 athletes to run a 110 m hurdle race are tabulated below:
| Class | 13.8 – 14 | 14 – 14.2 | 14.2 – 14.4 | 14.4 – 14.6 | 14.6 – 14.8 | 14.8 – 15.0 |
| Frequency | 2 | 4 | 5 | 71 | 48 | 20 |
The number of athletes who completed the race in less than 14.6 seconds is:
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?
As the number of tosses of a coin increases, the ratio of the number of heads to the total number of tosses will be `1/2`. Is it correct? If not, write the correct one.
