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Calculating probabilities using TINSpire Normalcdf function

Calculating probabilities using TINSpire Normalcdf function

IB Year 6 | Grade 12

If \(X \sim N(50,100)\) use your GDC to find

  1. \(P(X < 62)\)
  2. \(P(X > -45)\)
  3. \(P(-45 < X < 62)\)
  4. \(P(|X| > 45)\)
  5. \(P(|X - 30| \geq 5)\)

Solution:

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Answer:(a) \(0.885\). (b) \(1.00\) (rounded; strictly less than \(1\)). (c) \(0.885\). (d) \(0.691\). (e) \(0.939\). All to 3 s.f.

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