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If the mean of n observation a x1, a x2...

If the mean of `n` observation `a x_1, a x_2, a x_3, ,a x_n` is `a barX` , show that `(a x_1-a barX )+(a x_2-a barX )++(a x_n-a barX)=0`

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RD SHARMA ENGLISH-MEASURES OF CENTRAL TENDENCY-All Questions
  1. Find the mean of the following distribution: x: 4 6 9 10 ...

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  2. Following table shows the weights of 12 students: Weight (in kgs):...

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  3. If the mean of n observation a x1, a x2, a x3, ,a xn is a barX , ...

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  4. If the mean of 6, 4, 7, p and 10 is 8, find the value of p.

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  5. Find the sum of the deviations of the variate values 3,4,6,8, 14 from ...

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  6. The mean of 40 observations was 160. It was detected on rechecking ...

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  7. If the heights of 5 persons are 144 cm, 152cm, 151cm, 158 cm and 155...

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  8. Find the arithmetic mean of first 6 natural numbers.

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  9. Find the arithmetic mean of first ten odd natural numbers

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  10. The weights (in kg) of 15 students are: 31, 35, 27, 29, 32, 43, 37, ...

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  11. Find the median of the following data: 19, 25, 59, 48, 35, 31, 30, 32,...

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  12. Find the mode from the following data: 110,120,130,120,110,140,130,120...

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  13. If the heights of 5 persons are 144cm, 152cm, 151cm, 158cm and 155c...

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  14. Find the arithmetic means of first 6 natural numbers.

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  15. Find the arithmetic mean of first ten odd natural numbers.

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  16. If the mean of n observations ax1, ax2, ax3, ...., axn is aX show that...

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  17. If the mean of 6, 4, 7, p and 10 is 8, find the value of p

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  18. Find the sum of the deviations of the variate values 3, 4, 6, 8, 14 ...

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  19. The mean of 40 observations was 160. It was detected on rechecking ...

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  20. The mean of 100 items was found to be 30. If at the time of calcula...

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