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Categorical, Numerical and Grouped Data | O Level Mathematics 4024 & IGCSE Mathematics 0580 | Detailed Free Notes To Score An A Star (A*)

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  • Mean
    • It is the average of the data
    • For ungrouped data, just add all the numbers and divide by the total number of numbers
  • Median
    • It is the middle value
    • For the middle value of an ungrouped data, just arranged the data in ascending or descending order
      • If the total number of values is odd, then select the middle value from the ordered data
      • If the total number of values is even, then take the middle two values, add them and divide them by 2.
  • Mode
    • Mode is the highest repeating number in the data
    • For ungrouped data, just see which number is occurring the most number of times.
  • Range
    • It is the difference between the largest and smallest value in the ungrouped data.
  • For grouped data
    • First method
      • Find the midpoint of each class interval
        • (Upper limit + Lower limit)/2
      • Multiply the midpoint with the frequency to find f(x) of the class interval
      • Add all these f(x) for all the class intervals
      • Divide them by total frequency
  • Modal Class
    • The class interval that has the highest frequency is the modal class.
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