51. If Y = aX ± b, where a and b are any two numbers and a ≠ 0, then the range of Y values will be:

52. If the maximum value in a series is 25 and its range is 15, the maximum value of the series is:

53. Half of the difference between upper and lower quartiles is called:

54. If Q3=20 and Q1=10, the coefficient of quartile deviation is:

55. Which measure of dispersion can be computed in case of open-end classes?

56. If Y = aX ± b, where a and b are any two constants and a ≠ 0, then the quartile deviation of Y values is equal to:

57. The sum of absolute deviations is minimum if these deviations are taken from the:

58. The mean deviation is minimum when deviations are taken from:

59. If Y = aX ± b, where a and b are any two numbers but a ≠ 0, then M.D(Y) is equal to:

60. The mean deviation of the scores 12, 15, 18 is:

61. Mean deviation computed from a set of data is always:

62. The average of squared deviations from mean is called:

63. The sum of squares of the deviations is minimum, when deviations are taken from:

64. Which of the following measures of dispersion is expressed in the same units as the units of observation?

65. Which measure of dispersion has a different unit other than the unit of measurement of values:

66. Which of the following is a unit free quantity:

67. If the dispersion is small, the standard deviation is:

68. The value of standard deviation changes by a change of:

69. The standard deviation one distribution dividedly the mean of the distribution and expressing in percentage is called:

70. The positive square root of the mean of the squares of the cleviations of observations from their mean is called:

71. The variance is zero only if all observations are the:

72. The standard deviation is independent of:

73. If there are ten values each equal to 10, then standard deviation of these values is:

74. S.D(X) = 6 and S.D(Y) = 8. If X and Yare independent random variables, then S.D(X-Y) is:

75. For two independent variables X and Y if S.D(X) = 1 and S.D(Y) = 3, then Var(3X - Y) is equal to:

76. If Y = aX ± b, where a and b are any two constants and a ≠ 0, then Vat (Y) is equal to:

77. If Y = aX + b, where a and b are any two numbers but a ≠ 0, then S.D(Y) is equal to:

78. The ratio of the standard deviation to the arithmetic mean expressed as a percentage is called:

79. Which of the following statements is correct?

80. Which of the following statements is false?

81. If Var(X) = 25, then is equal to:

82. To compare the variation of two or more than two series, we use

83. The standard deviation of -5, -5, -5, -5, 5 is:

84. Standard deviation is always calculated from:

85. The mean of an examination is 69, the median is 68, the mode is 67, and the standard deviation is 3. The measures of variation for this examination is:

86. The variance of 19, 21, 23, 25 and 27 is 8. The variance of 14, 16, 18, 20 and 22 is:

87. In a set of observations the variance is 50. All the observations are increased by 100 %. The variance of the increased observations will become:

88. Three factories A, B, C have 100, 200 and 300 workers respectively. The mean of the wages is the same in the three factories. Which of the following statements is true?

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