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Find the Z scores for the following normal distribution problems

a. µ = 604, σ = 56.8, X ≤  635

b. µ = 48,  σ = 12, X < 20

c. µ = 111, σ = 33.8, 100 ≤ X ≤ 150

d. µ = 264, σ = 10.9, 250 < X < 255

e. µ = 37, σ = 4.35, X > 35

f. µ = 156, σ = 11.4, X  ≥  170

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