The given table shows the grades distribution of 40 students in one class after an exam. Number of students Grade 3 66 69 4 74 2 78 4 84 86 6. 90 4 94 97 99 You are required to: a) ICalculate the Mean grade. b) I Caleulate the Median grade. Caleulate the Mode(s) grade. d) Caleulate the Range of the grades. 23

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