W - 5: SOLVE & INTERPRET PERCENTILES (GROUPED DATA)

• Percentile


  Measure of position that indicates the value below which a given percentage of observations in a group of observations fall
• Calculating percentiles for grouped data

  1. Determine the Pk class

  2. Substitute values into the formula

  3. Calculate the percentile value
• Frequency (f)


  Number of students in each readability score range
• <cf


  Cumulative frequency up to the previous range