CBSE  /  Class 10  /  Maths  /  Statistics

  • 1. 
    of observations = 9

  • 2. 
    Mode and mean of a data are 12k and 15A. Median of the data is

  • 12k
  • 14k
  • 15k
  • 16k

  • 3. 
    The times, in seconds, taken by 150 atheletes to run a 110 m hurdle race are tabulated below:

  • 11
  • 71
  • 82
  • 130

  • 4. 
    The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its

  • mean
  • median
  • mode
  • all the three above

  • 5. 
    Mean of n numbers x1, x2, … xn is m. If xn is replaced by x, then new mean is

  • m - xn + x
  • \(\frac{nm-x_n+x}{n}\)
  • \(\frac{(n-1)m+x}{n}\)
  • \(\frac{m-x_n+x}{n}\)

  • 6. 
    While computing mean of grouped data, we assume that the frequencies are [NCERT Exemplar Problems]

  • evenly distributed over all the classes
  • centred at the classmarks of the classes
  • centred at the upper limits of the classes
  • centred at the lower limits of the classes

  • 7. 
    Mean of 100 items is 4 It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively. The correct mean is

  • 48
  • 49
  • 50
  • 60

  • 8. 
    The times, in seconds, taken by 150 atheletes to run a 100 m hurdle race are tabulated below:

  • 13
  • 69
  • 82
  • 130

  • 9. 
    For the following distribution

  • 13
  • 25
  • 10
  • 12

  • 10. 
    In the given data:

  • 38
  • 20
  • 19
  • 0
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