Step 1: Determine the values and weights and write it down on paper. Calculate the weighted average of the grades of Lili. Each subject weighs 60, 70, 65, 80, and 90 respectively. Lili has obtained 40 marks in chemistry, 60 in mathematics, 50 in physics, 55 in computer science, and 70 marks in history in the 2 nd semester of her graduation degree.
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