SOLUTION: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P(−b<z<b)=0.12, find b.

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Question 1176404: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P(−b
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

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.