6. Statistics — basic concepts, Mean, Median, Mode. Histograms and Ogive.
(a) Computation of: Measures of Central Tendency: Mean, median, mode for raw and arrayed data. Mean*, median class and modal class for grouped data (both continuous and discontinuous).
Mean by all 3 methods included:
- Direct: Σfx / Σf
- Short-cut: A + (Σfd / Σf) where d = x − A
- Step-deviation: A + (Σft / Σf) × i where t = (x − A)/i