Statistics Book Back Questions

9th Standard

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Maths

Time : 00:45:00 Hrs
Total Marks : 30
    4 x 1 = 4
  1. Data available in an unorganized form is called ------------- data

    (a)

    Grouped data

    (b)

    class interval

    (c)

    mode

    (d)

    raw data

  2. Let m be the mid point and b be the upper limit of a class in a continuous frequency distribution. The lower limit of the class is

    (a)

    2m - b

    (b)

    2m+b

    (c)

    m-b

    (d)

    m-2b.

  3. The algebraic sum of the deviations of a set of n values from their mean is

    (a)

    0

    (b)

    n-1

    (c)

    n

    (d)

    n+1

  4. If the mean of five observations x, x+2, x+4, x+6, x+8, is 11, then the mean of first three observations is

    (a)

    9

    (b)

    11

    (c)

    13

    (d)

    15

  5. 2 x 2 = 4
  6. Find the mode for the set of values 17, 18, 20, 20, 21, 21, 22, 22.

  7. A set of numbers consists of five 4’s, four 5’s, nine 6’s,and six 9’s. What is the mode.

  8. 4 x 3 = 12
  9. The following data gives the number of residents in an area based on their age. Find the average age of the residents

    Age 0-10 10-20 20-30 30-40 40-50 50-60
    Number of Residents 2 6 9 7 4 2
  10. The arithmetic mean of 6 values is 45 and if each value is increased by 4, then find the arithmetic mean of new set of values

  11. The mean weight of 4 members of a family is 60kg.Three of them have the weight 56kg, 68kg and 72kg respectively. Find the weight of the fourth member

  12. Find the median of the given values : 47, 53, 62, 71, 83, 21, 43, 47, 41.

  13. 2 x 5 = 10
  14. Calculate the median for the following data:

    Height (cm) 160 150 152 161 156 154 155
    No. of Students 12 8 4 4 3 3 7
  15. n a distribution, the mean and mode are 66 and 60 respectively. Calculate the median.

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