Quick questions on Continuous random variables and the normal distribution: WACE Year 12 Mathematics Methods Unit 4

Q: What is sign of the z-score?

A value below the mean gives a negative z. Using symmetry, P(Z a), so keep track of which tail you want.

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What is sign of the z-score?

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A value below the mean gives a negative

z

. Using symmetry,

P(Z < -a) = P(Z > a)

, so keep track of which tail you want.

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