2025 Maths Adv HSC Q23 Solve problem involving normally distributed scores, empirical rule & ratios

Keywords: normal distribution, 68-95-99.7 rule, z-score, mean, standard deviation, bell curve Sample solution: © The Maths Studio (themathsstudio.net) Source: © NSW Education Standards Authority Disclaimer: This sample solution is intended as a guide only and does not necessarily represent the best way to answer the question, nor is there any guarantee of accuracy.