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A2 Unit 4 Applied Mathematics B

Quick questions on The Normal distribution: standardising and probabilities - WJEC 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 q1?
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X∼N(100,152)X \sim N(100, 15^2). Standardise the value 130130. [2 marks]
What is q2?
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Find P(Z<−1)P(Z < -1) for the standard Normal. [2 marks]
What is q3?
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For X∼N(20,52)X \sim N(20, 5^2), find P(X>25)P(X > 25). [2 marks]

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