Question: 1. If z is a standard normal score, find Pr(- 1 z -0.5). 2. Find Pr(1.23 z 2.55). 3. If a

1. If z is a standard normal score, find Pr(- 1 ≤ z ≤ -0.5).
2. Find Pr(1.23 ≤ z ≤ 2.55).
3. If a variable x is normally distributed, with μ = 25 and σ = 5, find Pr(25 ≤ x ≤ 30).

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