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If the mean deviation about the median o...

If the mean deviation about the median of the numbers a, 2a, ....., 50a is 50, then |a| equals : (1) 2 (2) 3 (3) 4 (4) 5

A

5

B

2

C

3

D

4

Text Solution

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The correct Answer is:
D
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MCGROW HILL PUBLICATION-STATISTICS -QUESTION FROM PREVIOUS YEARS. AIEE/ JEE MAIN PAPERS
  1. If the mean deviation of the numbers 1,""1""+""d ,""1""+""2d ,""..."",...

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  2. For two data sets, each of size 5, the variances are given to be 4 and...

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  3. If the mean deviation about the median of the numbers a, 2a, ....., ...

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  4. A scientist is weighing each of 30 fishes. Their mean weight worked ou...

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  5. All the students of a class performed poorly in Mathematics. The te...

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  6. If the median and the range of four numbers {x,y, 2x+ y,x -y} , "wher...

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  7. The mean of a data set consisting of 20 observations is 40. If on obse...

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  8. The variance of first 50 even natural numbers is (1) (833)/4 (2...

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  9. In a set of 2n distinct observation, each of the observation below the...

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  10. Let overset (-) x and M.D. be the mean and the mean deviations about ...

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  11. A factory is operating in two shifts, day and night with 70 and 30 wor...

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  12. The mean of the data set comprising of 16 observations is 16. If on...

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  13. If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then w...

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  14. If the mean deviation of the numbers 1,""1""+""d ,""1""+""2d ,""..."",...

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  15. The mean of 5 observations is 5 and their variance is 124. If three of...

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  16. The mean age of 25 teanchers of a school is 40 years. A teacher retire...

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  17. The sum of 100 observations and sum of their squares are 400 and 2,475...

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  18. If sum(i=1)^9 (xi-5)=9 and sum(i=1)^9 (xi-5)^2=45 then the standard d...

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  19. The mean of a set of 30 observations is 75. If each observations is mu...

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  20. If the mean of the data 7,8,9,7,lambda , 8, is 8 then variance of t...

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