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प्रश्न
While computing mean of grouped data, we assume that the frequencies are ______.
पर्याय
evenly distributed over all the classes
centred at the class marks of the classes
centred at the upper limits of the classes
centred at the lower limits of the classes
उत्तर
While computing mean of grouped data, we assume that the frequencies are centred at the classmarks of the classes.
Explanation:
In computing the mean of grouped data, the frequencies are centred at the class marks of the classes.
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संबंधित प्रश्न
A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.
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| Number of students | 11 | 10 | 7 | 4 | 4 | 3 | 1 |
Find the missing value of p for the following distribution whose mean is 12.58
| x | 5 | 8 | 10 | 12 | P | 20 | 25 |
| f | 2 | 5 | 8 | 22 | 7 | 4 | 2 |
Find the missing frequencies in the following frequency distribution if it is known that the mean of the distribution is 50.
| x | 10 | 30 | 50 | 70 | 90 | |
| f | 17 | f1 | 32 | f2 | 19 | Total 120 |
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| No. of misprints per page (x) | 0 | 1 | 2 | 3 | 4 | 5 |
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Find the average number of misprints per page.
Find the mean of each of the following frequency distributions
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| Frequency | 5 | 8 | 12 | 20 | 3 | 2 |
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| Class | 0 – 10 | 10 – 20 | 20 – 30 | 30 – 40 | 40 – 50 |
| Frequency | 7 | 10 | 15 | 8 | 10 |
If the mean of n observation ax1, ax2, ax3,....,axn is a`bar"X"`, show that `(ax_1 - abar"X") + (ax_2 - abar"X") + ...(ax_"n" - abar"X")` = 0.
The median from the table is?
| Value | Frequency |
| 7 | 2 |
| 8 | 1 |
| 9 | 4 |
| 10 | 5 |
| 11 | 6 |
| 12 | 1 |
| 13 | 3 |
Find the mean of the following frequency distribution:
| Class: | 10 – 15 | 15 – 20 | 20 – 25 | 25 – 30 | 30 – 35 |
| Frequency: | 4 | 10 | 5 | 6 | 5 |
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