Clear, step-by-step walk-throughs for calculating percentages, credit-weighted GPAs, standard deviation, and algebra.
A percentage is a proportion expressed as parts per hundred. To calculate a percentage of any number, convert the percentage to a decimal by dividing by 100 and multiply by the total amount. To find what percentage one number represents of another, divide the partial amount by the total amount and multiply the result by 100.
Grade Point Average (GPA) is calculated by converting each letter grade into a numerical point value (usually on a 4.0 scale), multiplying that value by the course's credit hours to determine 'quality points', summing the quality points for all classes, and dividing by the total number of credit hours attempted.
We are currently drafting and fact-checking these additional cornerstone guides:
Population vs sample standard deviation, variance, and data distribution spread.
Trigonometric modes, logarithms, roots, memory registers, and powers.