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प्रश्न
Calculate the mean for the following distribution:
| x : | 5 | 6 | 7 | 8 | 9 |
| f : | 4 | 8 | 14 | 11 | 3 |
उत्तर
| x | f | fx |
| 5 | 4 | 20 |
| 6 | 8 | 48 |
| 7 | 14 | 98 |
| 8 | 11 | 88 |
| 9 | 3 | 27 |
| N= 40 | `sumfx 281.` |
∴ Mean`bar x = (sumfx)/ N`
= `281 / 40`
= 7.025
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संबंधित प्रश्न
Find the mean of first five natural numbers .
If M is the mean of x1 , x2 , x3 , x4 , x5 and x6, prove that
(x1 − M) + (x2 − M) + (x3 − M) + (x4 − M) + (x5 — M) + (x6 − M) = 0.
Find the values of n and X in each of the following cases :
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(ii) `sum _(i = 1)^n` (xi - 10) = 30 `sum _(i = 6)^n` (xi - 6) = 150 .
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| x : | 19 | 21 | 23 | 25 | 27 | 29 | 31 |
| f : | 13 | 15 | 16 | 18 | 16 | 15 | 13 |
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The mean of nine numbers is 77. If one more number is added to it then the mean increases by 5. Find the number added in the data.
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