Question 1176404
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Hi
Normal Distribution:    μ = 0 and    σ = 1 
using a TI or similarly an inexpensive calculator like a Casio fx-115 ES plus:

If P(-b > z < b) = 0.12  ⇒  2P(z ≤ -b)= .12  and P(z ≤ -b) = .06

 invNorm(.06) = -1.5548   ⇒    b = 1.5548

Wish You the Best in your Studies.
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