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World 4 · Probability & Distributions · 7 min · PRO

Variance & spread

How wide is the distribution?

PRO · Calculus & Probability

World 4: Probability & Distributions is part of PRO

The first world of Calculus & Probability is free. PRO opens the other 48 lessons in 6 worlds — simulations, quizzes and all.

  • Sample space & events
  • Combining probabilities
  • The two-dice sum
  • Random variables
  • Expected value
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  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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