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Ever scored 85 on one exam and 78 on another, and felt oddly prouder of the 78? That’s the z-score

“The average test score was 75” tells you where the center is — but it says nothing about whether everyone

Mean, median, and mode are the three ways statisticians answer the simplest question in data: “what’s typical?” They sound interchangeable,

Two points on a grid. How far apart are they? What’s exactly halfway between them? These two questions — answered

Most right triangles force you to grind through the Pythagorean theorem or look up trig ratios. But two special triangles