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प्रश्न
Let x, y, z be three observations. The mean of these observations is ______.
विकल्प
`(x xx y xx z)/3`
`(x + y + z)/3`
`(x - y - z)/3`
`(x xx y + z)/3`
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उत्तर
Let x, y, z be three observations. The mean of these observations is `underlinebb((x + y + z)/3)`.
Explanation:
Here, x, y and z be three observations.
We know that,
Mean = `"Sum of observations"/"Number of observations"`
= `(x + y + z)/3`
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संबंधित प्रश्न
The mean of 35 observations is 20, out of which mean of first 18 observations is 15 and mean of last 18 observation is 25. Find the 18th observation.
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`
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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
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