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प्रश्न
What secondary data?
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उत्तर
The word data means information statistical data and of two types
(i) Primary data, (ii) Secondary data
Secondary data: data which are not originally collected rather obtained from published or unpublished sources are known as secondary data.
Secondary data are collected by an individual or an institution for some purpose and are used by someone else in another context
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संबंधित प्रश्न
What do you understand by the word “statistics” in
(i) Singular form
(ii) Plural form?
Describe some fundamental characteristics of statistics.
Explain the meaning of the term True class limits.
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 |
| No. of girls |
2 | 8 | 12 | 20 | 8 |
Find the mean, median and mode of the above data.
The table below shows the daily expenditure on food of 30 households in a locality:
| Daily expenditure (in Rs) | Number of households |
| 100 – 150 | 6 |
| 150 – 200 | 7 |
| 200 – 250 | 12 |
| 250 – 300 | 3 |
| 300 – 350 | 2 |
Find the mean and median daily expenditure on food.
Find the class marks of classes 10 -25 and 35 – 55.
If the median of `x/5,x/4,x/2,x and x/3`, where x > 0, is 8, find the value of x.
Hint Arranging the observations in ascending order, we have `x/5,x/4,x/3,x/2,x Median= x/3=8.`
The daily income of a sample of 50 employees are tabulated as follows:
| Income (in Rs.): | 1-1200 | 201 -400 | 401-600 | 601 - 800 |
| No.of employees : | 14 | 15 | 14 | 7 |
Find the mean daily income of employees.
Explain the meaning of the following terms: Variate
Find the range of given data: 46, 35, 78, 90, 20, 56, 45, 76.
