CBSE  /  Class 11  /  Maths  /  Statistics

  • 1. 
    The sum of 10 items is 12 and the sum of their squares is 18. The standard deviation is

  • 1/5
  • 2/5
  • 3/5
  • 4/5

  • 2. 
    The algebraic sum of the deviation of 20 observations measured from 30 is 2. So, the mean of observations is

  • 30.0
  • 30.1
  • 30.2
  • 30.3

  • 3. 
    The coefficient of variation is computed by

  • S.D/.Mean×100
  • S.D./Mean
  • Mean./S.D×100
  • Mean/S.D.

  • 4. 
    When tested the lives (in hours) of 5 bulbs were noted as follows: 1357, 1090, 1666, 1494, 1623. The mean of the lives of 5 bulbs is

  • 1445
  • 1446
  • 1447
  • 1448

  • 5. 
    If mode of a series exceeds its mean by 12, then mode exceeds the median by

  • 4
  • 8
  • 6
  • 12

  • 6. 
    The median and SD of a distributed are 20 and 4 respectively. If each item is increased by 2, the new median and SD are

  • 20, 4
  • 22, 6
  • 22, 4
  • 20, 6

  • 7. 
    Range of the data 4, 7, 8, 9, 10, 12, 13 and 17 is

  • 4
  • 17
  • 13
  • 21

  • 8. 
    If Mean = Median = Mode, then it is

  • Symmetric distribution
  • Asymmetric distribution
  • Both symmetric and asymmetric distribution
  • None of these

  • 9. 
    If the difference of mode and median of a data is 24, then the difference of median and mean is

  • 12
  • 24
  • 8
  • 36

  • 10. 
    If r is the correlation coefficient, then

  • |r| ≤ 1
  • r ≤ 1
  • |r| ≥ 1
  • r ≥ 1
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