Writing Exam Algorithms in Python: 5-Question Walkthrough | OCR J277 Paper 2

Welcome back to our OCR GCSE Computer Science (J277) revision series! Today, we are putting our programming skills to the test with a custom 5-question mock paper focused entirely on writing algorithms. We will walk through how to code the solutions in Python, securing every single mark on the mark scheme. We will cover: - Q1 (5 Marks): Writing a `while` loop for input validation (trapping invalid test scores). - Q2 (6 Marks): Iterating through a 1D array to calculate a running total and an average. - Q3 (4 Marks): Using `len()` and string indexing to validate a password. - Q4 (5 Marks): Defining a modular function with a parameter and a `return` value. - Q5 (6 Marks): Searching a 2D array using a `FOR` loop and a Boolean flag to handle 'Not Found' scenarios.