1) The sum of squared deviation is least from_________________? a. Median b. Mean c. Mode d. Standard Deviation
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2) The average of first n natural numbers is_______________? a. n+12 b. n2 c. All of the above d. None of these
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3) The mean of a constant “b” is_________________? a. Zero b. b c. None
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4) Sum of deviations will be zero if it is taken from_________________? a. Mean b. Mode c. Median d. Standard Deviation
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5) The mean of 10 numbers is 9, then sum of these numbers will be__________________? a. 9 b. 0.9 c. 70 d. 90
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6) For a certain distribution if ∑(x−2)=18,∑(x−24)=0,∑(x−28)=−24) then arithmetic mean is_______________? a. 21 b. 24 c. 28 d. 0
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7) Arithmetic mean of two positive numbers “X” and “Y” is_________________? a. ab2 b. 2a2 c. (a+b)/2 d. a−b2 e. 2a+b
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8) The calculation of mean and variance is based on______________? a. Small values only b. Large values only c. Extreme values only d. All values
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9) If β2=m4m22<3, the distribution is called______________? a. Normal b. Mesokurtic c. Leptokurtic d. Platykurtic
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10) The degree of peakedness is called__________________? a. Dispersion b. Skewness c. Symmetry d. Kurtosis
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11) Quartile Coefficient of skewness lies between______________? a. 0 and 1 b. -1 and +1 c. -1 and 0 d. None of these
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12) If the third moment about mean is zero then distribution is_______________? a. Mesokurtic b. Positively Skewed c. Symmetrical d. Negatively Skewed
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13) ____________ is used to criterion of consistency i.e for consistence performance? a. Range b. Standard Deviation c. Coefficient of Variation d. Mean Deviation
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14) For a symmetrical distribution approximately 68% of the cases are included between _________________? a. X¯¯¯¯−S and X¯¯¯¯+S b. X¯¯¯¯−2S and X¯¯¯¯+2S c. X¯¯¯¯−3S and X¯¯¯¯+3S d. None of these
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15) If Y=−8X − 5 and SD of X is 3, then SD of Y is _______________? a. 8 b. 3 c. 5 d. 24 e. None
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16) The variance of a constant is_______________? a. Zero b. Constant c. a d. None
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17) Var(2X+3) is________________? a. 5 Var(X) b. 4 Var(X) c. 4 Var(X)+3 d. 5 Var(X)+3
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18) Suppose for 40 observations, the variance is 50. If all the observations are increased by 20, the variance of these increased observation will be______________? a. 50 b. 70 c. 50/20 d. 50-20 = 30 e. 60
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19) The variance of 5 numbers is 10. If each number is divided by 2, then the variance of new numbers is______________? a. 20 b. 5 c. 2.5 d. 5.5 e. 0
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20) The standard deviation is always _________ than mean deviation? a. Greater b. Less c. Equal d. None
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