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If barx represents the mean of n observa...

If `barx` represents the mean of n observations `x_1, x_2,…….,x_n` , then value of `sum_(i=1)^n (x_1-barx)` is :

A

-1

B

0

C

1

D

n-1

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MODERN PUBLICATION-STATISTICS-EXERCISE
  1. The mean of five numbers is 30. If one number is excluded, their mean ...

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  2. If the mean of the observations : x, x + 3, x + 5, x + 7, x + 10 is 9,...

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  3. If barx represents the mean of n observations x1, x2,…….,xn , then val...

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  4. If each observation of the data is increased by 5, then their mean

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  5. The mean of 100 observations is 50. If one of the observations which w...

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  6. There are 50 numbers. Each number is subtracted from 53 and the mean o...

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  7. The mean of 25 observations is 36. Out of these observationsif the mea...

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  8. The median of the data 78, 56, 22, 34, 45, 54, 39, 68, 54, 84 is

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  9. Median of the following numbers : 4, 4, 5, 7, 6, 7, 7, 12, 3 is

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  10. Mode of the data 15, 14, 19, 20, 14, 15, 1 6, 14, 15, 18, 14, 19, 15, ...

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  11. For drawing a frequency polygon of a continuous frequency distribution...

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  12. If the mean of x and 1/x is M, then the mean of x^2 and 1//x^2 is

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  13. The mean of the ungrouped data is given by

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  14. The mean of xi and x2 is M1 and that of x1,x2,x3,x4 is M2. Then the me...

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  15. If M and Mg represents the mean of the raw and grouped data, respectiv...

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  16. The mean of the cubes of the fist n natural number is

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  17. The mean of first 10 natural numbers is

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  18. The average age of a group of eight is same as it was 3 years ago, whe...

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  19. The arithematic mean of 6,10,x and 12 is 8. the value of x is

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  20. The mean age of combined groupd of men and women is 25 years. If the m...

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