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Chapter 5 — Chapter 5 — Data Analytics
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📘Easy summary
Data analytics is examining data to find useful information, patterns and conclusions. Measures of central tendency describe the centre of a data set. Mean (average) = sum of values ÷ number of values. Median = the middle value when data are arranged in order (average of the two middle values for an even count). Mode = the value that occurs most often. Mean is affected by extreme values (outliers); median is not.
⭐Key points
- Mean = Σx ÷ n.
- Median = middle of ordered data.
- Mode = most frequent.
🔬Diagram
🌿Real-life example
Marks 60, 70, 80: mean 70, median 70.
💡Exam tip
- Sort the data before finding the median.
✅Quick check
1. Most frequent value:
2. Mean of 2, 4, 6:
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