5. Practice Questions with Detailed Solutions Try each question yourself first. Every solution follows the same pattern: formula, substitution, step-by-step calculation, final answer. Level 1: Basic Question 1 Basic The rainfall (in mm) recorded on six days was 12, 8, 15, 11, 10, 16. Find the mean daily rainfall. Solution Formula. x = Σxn Substitute. […]

Open a spreadsheet with the marks of 60 students or the daily sales of a shop and you see a wall of numbers. It is very hard to say what the data is telling you. Measures of central tendency fix this: each one gives a single number that stands for the “centre” or the “typical […]

Welcome to a brand-new chapter! So far we have mastered Permutations, Combinations and the basics of Probability. Now we step into the world of Statistics — the subject that helps us make sense of data and uncertainty in everyday life. What is Statistics? In simple words, Statistics is the science of collecting, organising, analysing, interpreting […]

In the previous post we learned conditional probability: how the chance of an event changes once we know that another event has happened. Bayes’ theorem takes the very next step. It lets us reverse a conditional probability, so that from an effect we can work backwards to its most likely cause. In this post we […]

Welcome to your complete Statistics learning roadmap. This page shows the full journey — from the very basics of describing data all the way to advanced limit theorems. Use it as a checklist while you study. How to Use This Syllabus Start from Section 1 and move in order. Master each topic with examples and […]

Time complexity is one of the most important concepts in DSA. It tells us how the running time of an algorithm changes when the input size gets bigger (from 10 items → 100 → 10,000 → 1 million). Very simple idea: We want to know — “If the problem becomes 10× or 100× larger, does […]