School and grades
Test scores, weighted grades, pass marks, attendance and percent error for students and teachers.
School and gradesHow to calculate a test score percentage
Divide the points you earned by the points possible and multiply by 100. How to handle partial credit, sections worth different amounts, and extra credit.
School and gradesHow to calculate a weighted grade
Multiply each category average by its weight, add the results, and divide by the total weight completed so far. A worked example with homework, quizzes, a midterm and a final.
School and gradesWhat score do I need on my final exam?
Find the final exam score you need for a target course grade: subtract the weighted points you already have from the target and divide by the final's weight.
School and gradesPercentage vs percentile: what your score report means
A percentage score measures how much of a test you got right; a percentile rank measures how many people you scored above. The same score can be a high percentage and a low percentile.
School and gradesHow to calculate attendance percentage
Attendance percentage is sessions attended divided by sessions held. How to calculate it, and how many more absences you can have before dropping below a required level.
School and gradesHow much did my grade improve? Points vs percent
When a score goes from 60% to 75%, it improved 15 percentage points, 25% relative to the old score, and closed 37.5% of the gap to 100%. When to use each.
School and gradesHow many questions do I need right to pass?
Multiply the number of questions by the pass percentage and round up to the next whole question. What to do when questions are worth different points.
School and gradesHow to calculate a class average and pass rate
Class average and pass rate measure different things. How to calculate each, the change between tests, and how the average can rise while the pass rate falls.
School and gradesPercent error: the formula and how to use it in lab reports
Percent error = |measured − accepted| ÷ accepted × 100. How to use it in a lab report, why the absolute value is used, and how it differs from percentage difference.
School and gradesPercentage word problems: a method that works every time
Translate the words into an equation: “of” means multiply, “is” means equals, “what” is the unknown. A phrase table and eight solved percentage problems, from basic to tricky.