An interactive, scrollable reference tool for the normal distribution — students drag sliders to shade tail areas, watch the live z-table highlight in real time, and explore college-level formulas all in one browser-based dashboard. No login, no app, no printing required. How it works: Students open the single HTML file in any browser and immediately see an interactive normal curve. Sliders control μ, σ, and the x-value. A three-way toggle switches between left-tail, right-tail, and two-tail pro