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CHAPTER AT A GLANCE
Tales by Dots and Lines
•Unit: Data Handling
•Board weightage: Mean, median, the effect of adding or removing values, frequency tables, line graphs and spreadsheets give regular 2-mark, 3-mark and 4-mark questions (please check the latest sample paper)
•Key ideas from the textbook: mean as the balancing centre, effect on the mean of including or removing a value, adding or multiplying every value by a fixed number, median, mean and median from a frequency table, line graphs, spreadsheet formulae
•Most scoring part: finding a missing value from the mean (sum = mean × number of values), and mean and median from a frequency table
•Time to revise: about 60 minutes
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