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प्रश्न
The number of members in the 40 families in Bhilar are as follows:
1, 6, 5, 4, 3, 2, 7, 2, 3, 4, 5, 6, 4, 6, 2, 3, 2, 1, 4, 5, 6, 7, 3, 4, 5, 2, 4, 3, 2, 3, 5, 5, 4, 6, 2, 3, 5, 6, 4, 2. Prepare a frequency table and find the mean of members of 40 families.
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उत्तर
| Number of members `bb((x_i))` | Number of families `bb((f_i))` | `bb(f_ix_i)` |
| 1 | 2 | 2 |
| 2 | 8 | 16 |
| 3 | 7 | 21 |
| 4 | 8 | 32 |
| 5 | 7 | 35 |
| 6 | 6 | 36 |
| 7 | 2 | 14 |
| N = 40 | = 156 |
Since mean =
= `156/40`
= 3.9
So, the mean of members of 40 families is 3.9.
संबंधित प्रश्न
The enrolment in a school during six consecutive years was as follows:
1555, 1670, 1750, 2013, 2540, 2820
Find the mean enrolment of the school for this period.
The data 6, 4, 3, 8, 9, 12, 13, 9 has mean 9.
The following table shows the number of saplings planted by 30 students. Fill in the boxes and find the average number of saplings planted by each student.
| No. of saplings (Scores) xi |
No. of students (frequency) fi |
fi x xi |
| 1 | 4 | 4 |
| 2 | 6 | `square` |
| 3 | 12 | `square` |
| 4 | 8 | `square` |
| N = `square` | ∑fixi = `square` |
Mean `bar "x"` = `square/"N"`
= `square/square`
= `square`
∴ The average number of trees planted `square`
A batsman scored the following number of runs in six innings: 36, 35, 50, 46, 60, 55. Calculate the mean runs scored by him in an inning.
The average of integers between −10 to 10 is __________
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The mean of first fifteen even numbers is ____________
Which measures of central tendency get affected if the extreme observations on both the ends of a data arranged in descending order are removed?
Mean of the observations can be lesser than each of the observations.
The following are weights (in kg) of 12 people.
70, 62, 54, 57, 62, 84, 75, 59, 62, 65, 78, 60.
- Find the mean of the weights of the people.
- How many people weigh above the mean weight?
- Find the range of the given data.
