What is the value of za/2 for an 85% confidence interval?

What I did was 1-0.85 = .15/2 = 0.075, then 0.5-0.075 = 0.425, I looked up 0.425 on my stats table and it's 1.44. I belive this would be the same method to calculate the common ones like 95% confidence level = Z.025 = 1.96 correct? But on an online quiz I'm doing, it says the answer is .19

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