Percentile shows percentage of scores below a given number. Used in competitive exams like SAT and LSAT. Different from percentage, which considers fractions as one term
Arithmetic mean is sum of numbers divided by their count. Used in mathematics, statistics, economics, anthropology, and history. Can be denoted by bar symbol (x̄) or cent symbol (¢)
SQL AVG is an aggregate function that calculates average values across rows. Unlike single-row queries, aggregate functions operate on groups of rows. Results of aggregate functions aren't stored in database
Weighted average differs from regular arithmetic mean due to different values for each number. Numbers must be gathered and their weights must be converted to decimal form. Multiply each number by its corresponding weighting factor. Add all multiplied numbers together to find the average
Percent difference compares two numbers of same measurement as percentage. Formula: p = |a - b| / (a + b) ÷ 2 × 100
Determine the number of numbers in your sample. Identify the type of data being analyzed. Ensure all numbers are needed for the mean calculation