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The mean of the observations x-1, x and ...

The mean of the observations x-1, x and x + 1 is

A

3x

B

X

C

2x

D

0

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Observe the following statements : (A) : 10 is the mean of a set of 7 obervations and 5 is the mean of a set of 3 observations. The mean of a combined set is 9. (R ) : If bar(x)_(i)(i = 1,2,…,k) are the means of k - series n_(i)(I = 1,2,3,…,k) respectively, then the combined or composite mean is bar(x) = (n_(1)bar(x)_(1) + n_(2) bar(x)_(2) + ...+ n_(k)bar(x_(k)))/(n_(1)+n_(2)+...+n_(k))

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If the mean of a set of observations x_(1), x_(2),….., ……, x_(10) " is " 20 . Find the mean of x_(1) + 4, x_(2) + 8, x_(3) + 12, …., ……, x_(10) + 40 .

The means and variance of n observations x_(1),x_(2),x_(3),…x_(n) are 0 and 5 respectively. If sum_(i=1)^(n) x_(i)^(2) = 400 , then find the value of n

VGS PUBLICATION-BRILLIANT-STATISTICS-EXERCISE
  1. The mode of the data 8, 5, 3, 8, 3, 6, 5, 3, 7, 5 and 11 is

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  2. The difference between any two lower limits is called

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  3. The mean of the observations x-1, x and x + 1 is

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  4. The median of first 10 natural numbers is

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  5. 30-39, 40-49, 50-59 .. తరగతులు .. రకపు తరగతులు .

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  6. The mode of the distribution 2, 5, 7, 5, 3, 1, 5, 8, 7, 5 is

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  7. The median of the observations 15, 12, 14,20,16,10 is

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  8. Mid values are used to calculate ..........

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  9. Which of the following is not a measure of central tendency ?

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  10. The mode of the observations 8, 9, 10, 11, 12, 8, 9, 12, 9, 8, 9, 11, ...

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  11. The median of the observations 6, 21, 9, 19, 15 and 13 is

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  12. The lower limit of the class 60 - 69 is

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  13. The upper limit of the class 30-40 is

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  14. The mean of first ten odd natural numbers is

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  15. The width of the class interval 40-50 is

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  16. The value of among the observation of which occurs most frequently is ...

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  17. If three students with marks 26, 27 and 28 were joined, which class fr...

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  18. While drawing a bar graph, which class bar is the smallest in it's len...

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  19. In an ungrouped data there are 10 scores. After arranging them which t...

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  20. In an ungrouped data there are 10 scores. After arranging them which t...

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