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Statistics

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  1. 151.If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the followin…
  2. 152.The mean of 5 observations is 5 and their variance is 124.
  3. 153.If the mean deviation of the numbers 1, 1+d, , 1+100d from their mean is 255, then a value…
  4. 154.The mean of the data set comprising of 16 observations is 16.
  5. 155.Let the sum of the first three terms of an A.P.
  6. 156.A factory is operating in two shifts, day and night, with 70 and 30 workers respectively.
  7. 157.In a set of 2n distinct observations, each of the observations below the median of all the…
  8. 158.The variance of first 50 even natural numbers is
  9. 159.Let x, M and ^2 be respectively the mean, mode and variance of n observations x_1,x_2,,x_n…
  10. 160.Let X and M.D.
  11. 161.If the median and the range of four numbers x, y, 2x+y, x-y, where 0<y<x<2y, are 10 and 28…
  12. 162.The mean of a data set consisting of 20 observations is 40.
  13. 163.All the students of a class performed poorly in Mathematics.
  14. 164.In a set of 2n observations, half of them are equal to 'a' and the remaining half are equa…
  15. 165.Mean of 5 observations is 7.
  16. 166.The median of 100 observations grouped in classes of equal width is 25.
  17. 167.The frequency distribution of daily working expenditure of families in a locality is as fo…
  18. 168.Let x_1,x_2,,x_n be n observations, and let x be their arithmetic mean and ^2 be the varia…
  19. 169.Statement 1: The variance of first n odd natural numbers is n^2-13 Statement 2: The sum of…
  20. 170.If the mean of 4, 7, 2, 8, 6 and a is 7, then the mean deviation from the median of these …
  21. 171.A scientist is weighing each of 30 fishes.
  22. 172.If the mean deviation about the median of the numbers a, 2a,,50a is 50, then |a| equals
  23. 173.For two data sets, each of size 5, the variances are given to be 4 and 5 and the correspon…
  24. 174.If the mean deviation of the numbers 1, 1+d, 1+2d,,1+100d from their mean is 255, then d i…
  25. 175.Statement-1: The variance of first n even natural numbers is n^2-14 Statement-2: The sum o…
  26. 176.The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80.
  27. 177.The average marks of boys in class is 52 and that of girls is 42.
  28. 178.Suppose a population A has 100 observations 101, 102, , 200 and another population B has 1…
  29. 179.Let x_1,x_2,,x_n be n observations such that x_i^2=400 and x_i=80.
  30. 180.If in a frequency distribution, the mean and median are 21 and 22 respectively, then its m…
  31. 181.In a series of 2n observations, half of them equal a and remaining half equal -a.
  32. 182.Consider the following statements: (A) Mode can be computed from histogram (B) Median is n…
  33. 183.The median of a set of 9 distinct observations is 20.5.
  34. 184.In an experiment with 15 observations on x, the following results were available: x^2=2830…
  35. 185.In a class of 100 students there are 70 boys whose average marks in a subject are 75.
  36. 186.In an experiment with 15 observations on x, then following results were available: [ x^2 =…
  37. 187.Let x1, x2,...........,xn be n observations such that [ x_i^2 = 400] and [ x_i = 80].
  38. 188.The average marks of boys in a class is 52 and that of girls is 42.
  39. 189.Let x1, x2,........., xn be n observations, and let [ x ] be their arithematic mean and [ …
  40. 190.The mean and the standard deviation(s.d.) of five observations are9 and 0, respectively.
  41. 191.If both the mean and the standard deviation of 50 observations x1, x2,..., x50 are equal t…
  42. 192.If for some x [ ] R, the frequency distribution of the marks obtained by 20 students in a …
  43. 193.If mean and standard deviation of 5 observations x1, x2, x3, x4, x5 are 10 and 3, respecti…
  44. 194.The mean of five observations is 5 and their variance is 9.20.
  45. 195.The outcome of each of 30 items was observed; 10 items gave an outcome [1 2] -- d each, 10…
  46. 196.If the data x1, x2,......., x10 is such that the mean of first four of these is 11, the me…
  47. 197.5 students of a class have an average height 150 cm and variance 18 cm2.
  48. 198.For the frequency distribution : Variate (x) : x1 x2 x3 ....
  49. 199.Let the observations xi (1 [ ] i [ ] 10) satisfy the equations, [_i = 1^10 ( x_1 - 5 ) ] =…
  50. 200.Let in a series of 2n observations, half of them are equal to a and remaining half are equ…