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If the mean of the numbers 27+x, 31+x, 8...

If the mean of the numbers 27+x, 31+x, 89+x, 107+x, 156+x is 82, then the mean of 130+x, 126+x, 68+x, 50+x, 1+x is

A

75

B

157

C

82

D

80

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The correct Answer is:
A
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PATHFINDER-STATISTICS-QUESTION BANK
  1. Find the standard Deviation of 6 and 8.

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  2. Find the mean if the coefficient of variation is 5% and variance is 4.

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  3. If the mean of the numbers 27+x, 31+x, 89+x, 107+x, 156+x is 82, then ...

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  4. In a class of 100 students there are 70 boys whose average marks in su...

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  5. The median of a set of 9 distinct observations 20.5. If each of the la...

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  6. A set of numbers consisting of three 4's, five 5's, six 6's, eight 8's...

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  7. Find the mean deviation about the mean of the data : 7, 8, 4, 13, 9, 5...

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  8. Find the mean deviation about the median of the data : 34, 23, 46, 37,...

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  9. Find the mean if the coefficient of variation is 5% and variance is 4.

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  10. If co-efficient of variation = 45% and mean = 24. Find the standard De...

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  11. Two variables x and y are related by y = 2-3x If the S.D of x be 1.5 t...

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  12. The variance of first n natural numbers is 44. Find the value of n.

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  13. Find the range for the following frequency distribution :

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  14. The standard Deviation of 30 observation of a sample is 4.5 If each ob...

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  15. If the SD of the first numbers even integers be sqrt40, then find numb...

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  16. Find the mean and variance of the data : 5, 9, 8, 12, 6, 10, 6, 8

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  17. Find the SD of first 10 multiples of 3.

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  18. Calculate the mean deviation about median from the data : 340, 150, 21...

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  19. The variance of 20 observations is 5. If each observation be multipli...

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  20. The mean and standard deviation of observations are 8 and 14 respectiv...

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