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Cheat sheet · Class 12 · CBSE · Science Computer Science

Understanding Data cheat sheet

The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.

CBSE Class 12 · Computer Science

Cheat sheet

Chapter 9Understanding Data

Collect → Store → Process → Analyse → Present.

1. Data

  • Structured (tables) vs unstructured (text, images).
  • Sources: surveys, sensors, transactions, web.

2. Statistics in Python

MeasureMeaning
Meanaverage
Medianmiddle value
Modemost frequent
Rangemax − min
Standard deviationspread around the mean

statistics module: mean(), median(), mode(), stdev().

3. Key Points

  • Data cleaning removes errors and duplicates.
  • Storage: files, databases.
  • Visualise to spot patterns.
  • Privacy matters when handling data.

Remember: Data life cycle | mean, median, mode, range, SD

Understanding Data: questions and notes

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