1.

Finding the mean of classified data(a) The following table gives marks scored by students in an examination.Marks0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40Number of students3715241685.2(i) Calculate the mean mark, correct to two decimal places.(ii) Calculate the mean mark by taking the assumed mean a = 17.5.​

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