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प्रश्न
While computing mean of grouped data, we assume that the frequencies are ______.
विकल्प
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
Frequency distribution of daily commission received by 100 salesmen is given below :
|
Daily Commission (in Rs.) |
No. of Salesmen |
| 100-120 | 20 |
| 120-140 | 45 |
| 140-160 | 22 |
| 160-180 | 09 |
| 180-200 | 04 |
Find mean daily commission received by salesmen, by the assumed mean method.
The mean of the following distribution is 18. Find the frequency f of class 19 – 21.
| Class | 11-13 | 13-15 | 15-17 | 17-19 | 19-21 | 21-23 | 23-25 |
| Frequency | 3 | 6 | 9 | 13 | f | 5 | 4 |
Find the mean of the following data:-
| x | 19 | 21 | 23 | 25 | 27 | 29 | 31 |
| f | 13 | 15 | 16 | 18 | 16 | 15 | 13 |
The following distribution gives the number of accidents met by 160 workers in a factory during a month.
| No. of accidents(x) | 0 | 1 | 2 | 3 | 4 |
| No. of workers (f) | 70 | 52 | 34 | 3 | 1 |
Find the average number of accidents per worker.
Find the mean of each of the following frequency distributions
| Class interval | 0 - 8 | 8 - 16 | 16 - 24 | 24 - 32 | 32 - 40 |
| Frequency | 6 | 7 | 10 | 8 | 9 |
Consider the following distribution of daily wages of 50 workers of a factory:
| Daily wages (in ₹) |
500-520 | 520-540 | 540-560 | 560-580 | 580-600 |
| Number of workers | 12 | 14 | 8 | 6 | 10 |
Find the mean daily wages of the workers of the factory by using an appropriate method.
The algebraic sum of the deviations of a frequency distribution from its mean is always ______.
If the mean of the following distribution is 2.6, then the value of y is:
| Variable (x) | 1 | 2 | 3 | 4 | 5 |
| Frequency | 4 | 5 | y | 1 | 2 |
In the formula
The median from the table is?
| Value | Frequency |
| 7 | 2 |
| 8 | 1 |
| 9 | 4 |
| 10 | 5 |
| 11 | 6 |
| 12 | 1 |
| 13 | 3 |
