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प्रश्न
The number of Science and Mathematics projects submitted by Model high school, Nandpur in last 20 years at the state level science exibition is:
2, 3, 4, 1, 2, 3, 1, 5, 4, 2, 3, 1, 3, 5, 4, 3, 2, 2, 3, 2. Prepare a frequency table and find the mean of the data.
उत्तर
The frequency table of the data is as follows:
| Number of projects `bb((x_i))` | Frequency `bb((f_i))` | `bb(f_ix_i)` |
| 1 | 3 | 1 x 3 = 3 |
| 2 | 6 | 2 x 6 = 12 |
| 3 | 6 | 3 x 6 = 18 |
| 4 | 3 | 4 x 3 = 12 |
| 5 | 2 | 5 x 2 = 10 |
| ∑f = 20 | `sum f_ix_i` = 55 |
Since the mean of the data = `(sum f_ix_i)/(sumf)"`
`= 55/20`
= 2.75
Hence, the mean of the data is 2.75.
संबंधित प्रश्न
The calculated mean of 50 observations was 80. It was later discovered that observation 19 was recorded by mistake as 91. What was the correct mean?
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 (frequncy) 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`
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.
Find the mean of first six multiples of 3.
If the mean of the following data is 20.2, then find the value of p
| Marks | 10 | 15 | 20 | 25 | 30 |
| No. of students | 6 | 8 | p | 10 | 6 |
The mean of a set of numbers is `bar(X)`. If each number is multiplied by z, the mean is
The mean of first ten natural numbers is ____________
Find the mean of the following data.
5.1, 4.8, 4.3, 4.5, 5.1, 4.7, 4.5, 5.2, 5.4, 5.8, 4.3, 5.6, 5.2, 5.5
The mean of first fifteen even numbers is ____________
Let x, y, z be three observations. The mean of these observations is ______.
