CBSE Board Practice

Class VI Class VII Class VIII Class IX Class X
CBSE Grade IX - Statistics
Question 1
1.
    • Heights of 15 students are given below. Find the mean.
    • Height (in cm)
      129
      130
      141
      147
      149
      150
      163
      165
      169
      170
      No. of students
      1
      2
      3
      1
      1
      2
      1
      2
      1
      1
  • 448
    3
    cm
  • 454
    3
    cm
  • 150
    cm
  • 451
    3
    cm
  • 449
    3
    cm
Question 2
2.
    • Temperatures of 15 days are given below. Find the mean.
    • Temperature (in degree C)
      25
      27
      30
      31
      33
      34
      35
      No. of days
      1
      3
      2
      3
      3
      2
      1
  • 491
    15
    °C
  • 476
    15
    °C
  • 461
    15
    °C
  • 463
    15
    °C
  • 154
    5
    °C
Question 3
3.
    • Temperatures of 11 days (in °C) are given below. Find the mean temperature.
      • 29
      • 27
      • 28
      • 32
      • 35
      • 27
      • 28
      • 30
      • 28
      • 31
      • 30
  • 336
    11
    °C
  • 325
    11
    °C
  • 347
    11
    °C
  • 326
    11
    °C
  • 327
    11
    °C
Question 4
4.
    • Temperatures of 135 days (in °C) are given below.
    • Identify the class interval table for the given frequency polygon.
  • Temperature (in degree)
    27 - 32
    33 - 38
    39 - 44
    45 - 50
    51 - 56
    57 - 62
    No. of days
    40
    33
    8
    13
    21
    20
  • Temperature (in degree)
    27 - 32
    33 - 38
    39 - 44
    45 - 50
    51 - 56
    57 - 62
    No. of days
    40
    8
    33
    16
    21
    20
  • Temperature (in degree)
    27 - 32
    33 - 38
    39 - 44
    45 - 50
    51 - 56
    57 - 62
    No. of days
    40
    8
    30
    13
    21
    20
  • Temperature (in degree)
    27 - 32
    33 - 38
    39 - 44
    45 - 50
    51 - 56
    57 - 62
    No. of days
    40
    20
    33
    13
    21
    8
  • Temperature (in degree)
    27 - 32
    33 - 38
    39 - 44
    45 - 50
    51 - 56
    57 - 62
    No. of days
    40
    8
    33
    13
    21
    20
Question 5
5.
    • The true lower limit and true upper limit of the class with frequency x is
    • Class-Interval
      Frequency
      40 - 46
      2
      46 - 52
      22
      52 - 58
      x
      58 - 64
      6
      64 - 70
      18
  • 52
    -
    58.5
  • 51.5
    -
    58.5
  • 52.5
    -
    57.5
  • 51.5
    -
    58
  • 52
    -
    58
Question 6
6.
    • The following table gives the data regarding
    • the favourite sport of
    • 132
    • students of a school.
    • Find number of students who like
    • swimming
    • .
    • Sport
      swimming
      kabaddi
      table tennis
      long jump
      badminton
      No. of Students
      45
      27
      16
      12
      32
  • 44
  • 42
  • 47
  • 45
  • 46
Question 7
7.
Read the given column-graph. Find the month that has 17 cm rainfall.
  • November
  • June
  • September
  • October
  • July
Question 8
8.
    • The weights (in gm) of
    • 18
    • fruits are as follows.
    • Form the grouped frequency table
    • in exclusive form
    • by taking class size
    • 50
    • .
      • 245
      • 288
      • 391
      • 264
      • 289
      • 205
      • 381
      • 343
      • 349
      • 221
      • 340
      • 362
      • 339
      • 359
      • 271
      • 292
      • 349
      • 252
  • Weight (in gm)
    205 - 255
    255 - 305
    305 - 355
    355 - 405
    No. of Fruits
    4
    5
    5
    4
  • Weight (in gm)
    205 - 255
    255 - 305
    305 - 355
    355 - 405
    No. of Fruits
    4
    5
    8
    4
  • Weight (in gm)
    205 - 255
    255 - 305
    305 - 355
    355 - 405
    No. of Fruits
    4
    9
    5
    4
Question 9
9.
Find the mean of the first 15 odd numbers.
  • 15
  • 14
  • 13
  • 16
  • 17
Question 10
10.
    • If the mean of
    • 8
    • samples is
    • 24
      7
      8
    • ,
    • what is the new mean if each number is multiplied by
    • 7
    • .
  • 1741
    10
  • 1045
    6
  • 1391
    8
  • 1395
    8
  • 1393
    8