Hi
Normal Distribution: µ = .5 and σ = .05
Using TI or similarly an inexpensive calculator like an Casio fx-115 ES plus
normalcdf(smaller value, larger value, µ, σ).
P(x >.62 ) = normalcdf( .62, 9999, .5, .05) = .0082
P(.47 ≤ x ≤ .63) = normalcdf( .47, .63, .5, .05) = .7211
The line width of 90% of samples is below what value
z= Invnorm(.90) = 1.28
= .05(1.28) + .5
Recommend Using stattrek.com to check Results
until You are familiar with Using Your Calculator.
Trusting Your Use of Your calculator is key to success working with
Distributions.
Wish You the Best in your Studies.