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Quick questions on The normal distribution: probabilities, standardising and the inverse normal - Edexcel A-Level Maths

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is sign error when standardising?
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Z=X−μσZ = \dfrac{X - \mu}{\sigma}; below the mean gives a negative ZZ.
What is q1?
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For X∼N(50,16)X \sim N(50, 16), find P(X>54)P(X > 54). [3 marks]
What is q2?
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State the approximating normal distribution for X∼B(100,0.5)X \sim B(100, 0.5). [2 marks]

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