What is the difference between mean and median?

Mean is the average (sum/count), while median is the middle value. Median is more resistant to outliers. For symmetric data they're similar; for skewed data they differ significantly.

What does IQR tell me?

The Interquartile Range (IQR) spans the middle 50% of your data. It's robust to outliers and used to identify them: values below Q1-1.5×IQR or above Q3+1.5×IQR are typically considered outliers.

How do I identify outliers?

Lower bound: Q1 - 1.5 × IQR. Upper bound: Q3 + 1.5 × IQR. Any data point outside these bounds is a potential outlier.

What is the five-number summary?

A concise data description using: minimum, Q1, median, Q3, and maximum. These five numbers provide a quick understanding of data distribution, center, and spread.

Why is standard deviation important?

Standard deviation quantifies data variability. In a normal distribution, ~68% of data falls within 1 std dev of the mean, ~95% within 2, and ~99.7% within 3.

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Kalkulator statistika dasar gratis. Hitung mean, median, modus, rentang, varians, simpangan baku, dan kuartil.

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Mean = \frac{\sum x _{i}}{n}, Variance = \frac{\sum ( x _{i} - μ ) ^{2}}{n}, IQR = Q_{3} - Q_{1}

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