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Just a note

Algebraically, this coding is given by the formula: Yc =(Y - a)/b


  • Yc is the coded value of each class midpoint
  • Y is the value of each class midpoint
  • a is the lowest class midpoint
  • b is the class interval
In this case Yc = (Y - 185)/10
Substituting these recoded values for each class midpoint, we can then easily calculate the mean.