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The Normal Distribution

The Normal Distribution

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Question 43

A variable X X\,X is normally distributed. Given P(X<40)=0.2P(X < 40) = 0.2P(X<40)=0.2 and P(X>50)=0.3P(X > 50) = 0.3P(X>50)=0.3

a.

Find the two corresponding standard normal values of zzz.

[2]
b.

Hence find the mean and standard deviation of XXX.

[4]
Markscheme

The Normal Distribution Questions

  1. A Level
  2. /Maths
  3. /The Normal Distribution

591 exam-style questions on Edexcel A Level Maths The Normal Distribution, covering 3.1 The Normal Distribution, 3.2 Finding Probabilities for Normal Distributions, 3.3 The Inverse Normal Distribution Function, 3.4 The Standard Normal Distribution, 3.5 Finding the mean and standard deviation, 3.6 Approximating a Binomial Distribution, and 3.7 Hypothesis Testing with the Normal Distribution. Each one has a worked solution and a mark scheme showing where the marks go.

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