How to Calculate Descriptive Statistics

What is Descriptive Statistics?

Descriptive statistics summarize and describe the key features of a dataset: central tendency (mean, median, mode), spread (range, variance, standard deviation), and shape (skewness, kurtosis). They condense large datasets into interpretable summaries.

Step-by-Step Guide

1. 1Mean: sum of all values / count
2. 2Median: middle value when sorted (average of two middle values if even count)
3. 3Standard deviation: √(average squared deviation from mean)
4. 4Quartiles: Q1 (25th percentile), Q2 (median, 50th), Q3 (75th)

Worked Examples