Question: When does the z-score for normal distributions become negative? For example, if you are given that P(X>25) = 0.25, and we want to express this

When does the z-score for normal distributions become negative? For example, if you are given that

P(X>25) = 0.25, and we want to express this in terms of z, so that P(Z> 25- mean/st.dev), how would 0.25 change, and why would it's corresponding z score be positive/ negative?

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