Class IX

If the mean of the observation x, x+3, x+5, x+7, x+10 is 9, then that value of x is
  1. 5
  2. 4
  3. 0.2
  4. 0.25
Consider the marks obtained by 10 students in a maths test as given below: 40 45 35 79 50 68 77 83 47 69. The range of the given data is
  1. 85
  2. 35
  3. 48
  4. 45
The class mark of the class 120-180 is
  1. 120
  2. 180
  3. 150
  4. none of these
The most frequently occurring observation in the data is known as
  1. Mean
  2. Median
  3. Median Mode
  4. none of these
In the class interval, 10-20, 20-30 the number 20 is included in
  1. 43393
  2. 20-30
  3. both the intervals
  4. None of these
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