CAIE: A Level - Mathematics 9709 - Probability and Statistics 1
Representation of Data / Measure of Central Tendency and Spread
KEYPOINTS:
FOR UNGROUPED DATA
Mean = \(\bar{x} = \frac{\sum x}{n}\)
Standard Deviation = \(\sqrt{\frac{\sum(x-\bar{x})^2}{n}}\) = \(\sqrt{\frac{\sum{x}^2}{n}-\bar{x}^2}\)
FOR GROUPED DATA
Mean = \(\bar{x} = \frac{\sum xf}{\sum f }\)
Standard Deviation = \(\sqrt{\frac{\sum(x-\bar{x})^2 f}{\sum f}}\) = \(\sqrt{\frac{\sum{x}^2 f}{\sum f}-\bar{x}^2}\)
Standard Deviation is the Square Root of Variance [S.D = \(\sqrt{Var}\)]
Past Papers Topic Wise QuestionsA Level: Mathematics 9709 - Probability and Statistics 1Representation of Data | Measure of Central Tendency and Spread
