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CHAPTER AT A GLANCE
Statistics
•Unit: Statistics and Probability
•Board weightage: Statistics and Probability together carry about 11 marks out of 80; this chapter usually gives one 3-mark or 5-mark question on mean, median or mode (please check the latest sample paper)
•This textbook edition covers: mean of grouped data (direct method, assumed mean method, step deviation method), mode of grouped data and median of grouped data. Cumulative frequency graphs (ogives) are not in this edition.
•Most scoring part: finding the median class and the modal class correctly and substituting in the formula
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