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If the quartile deviation of a set of ob...

If the quartile deviation of a set of observations is 10 and the third quartile is 35, then the first quartile is

A

24

B

30

C

17

D

15

Text Solution

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The correct Answer is:
D
Recall the formula for quartile deviation.
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PEARSON IIT JEE FOUNDATION-STATISTICS-LEVEL-1
  1. The mode of observations 2x + 3, 3x - 2, 4x + 3, x - 1, 3x - 1, 5x + 2...

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  2. The median of 21 observations is 18. If two observations 15 and 24 ar...

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  3. If the quartile deviation of a set of observations is 10 and the third...

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  4. The lower class limit of inclusive type class interval 10-20.

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  5. The semi-inter quartile range of the observations 9, 12, 14, 6, 23, 36...

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  6. Find the mode of the following discrete series. {:(x,f," "x,f)...

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  7. The mean deviation of a^(3) + b^(3) "and" a^(3) - b^(3) (where a and b...

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  8. If the arithmetic mean of the observations x(1), x(2), x(3), ........,...

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  9. Range of 14, 12, 17, 18, 16 and x is 20. find x (x gt 0).

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  10. The mean of a set of observation is a. If each observation is multipli...

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  11. The mean deviation of first 8 composite numbers is .

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  12. Find the mode of the following discrete series. {:(x,f," "x,f...

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  13. The the highest score of certain data exceeds its lowest score by 16 a...

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  14. Find the mean deviation (approximately) about the mode for the followi...

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  15. The mean of first n odd natural numbers is (n^2)/(81) , then n= (a) 9...

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  16. The arithmetic of 12 observations is 15. If two observations 20 and ...

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  17. The arithmetic mean and mode of a data are 24 and 12 respectively, the...

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  18. The inter-quartile range of the observations 3, 5, 9, 11, 13, 18, 23, ...

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  19. Find the mean deviation from the mode for the following ungrouped data...

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  20. If the mean of the following frequency distribution is 5, then b = ...

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