CBSE  /  Class 10  /  Maths  /  Statistics
  • 1. 
    Cumulative frequency curve is also called

  • histogram
  • ogive
  • bar graph
  • median
  • 2. 
    The relationship between mean, median and mode for a moderately skewed distribution is

  • mode = median – 2 mean
  • mode = 3 median – 2 mean
  • mode = 2 median – 3 mean
  • mode = median – mean
  • 3. 
    The median of set of 9 distinct observations is 20.5. If each of the largest 4 observations of the set is increased by 2, then the median of the new set

  • is increased by 2
  • is decreased by 2
  • is two times of the original number
  • Remains the same as that of the original set.
  • 4. 
    Mode and mean of a data are 12k and 15A. Median of the data is

  • 12k
  • 14k
  • 15k
  • 16k
  • 5. 
    The times, in seconds, taken by 150 atheletes to run a 110 m hurdle race are tabulated below:
    Class Frequency
    13.8 – 14.0 2
    14.0 – 14.2 4
    14.2 – 14.4 5
    14.4 – 14.6 71
    14.6 – 14.8 48
    14.8 – 15.0 20
    The number of atheletes who completed the race in less then 14.6 seconds is:

  • 11
  • 71
  • 82
  • 130
  • 6. 
    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
  • 7. 
    Mean of n numbers x1, x2, … xn is m. If xn is replaced by x, then new mean is

  • m - xn + x
  • \(\frac{nm-x_n+x}{n}\)
  • \(\frac{(n-1)m+x}{n}\)
  • \(\frac{m-x_n+x}{n}\)
  • 8. 
    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
  • 9. 
    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
  • 10. 
    The times, in seconds, taken by 150 atheletes to run a 100 m hurdle race are tabulated below:
    Class Frequency
    13.8-14 3
    14 – 14.2 4
    14.2 – 14.4 6
    14.4 – 14.6 69
    14.6 – 14.8 48
    14.8 – 15.0 20

    The number of atheletes who completed the race in less than 14.6 seconds is

  • 13
  • 69
  • 82
  • 130
Report Question
warning
access_time
  Time