Given a normal distribution.
Find a symmetrically distributed interval [a,b] around the mean, µ, that will include 90% of the data when µ = 400, σ = 25.
Use three different ways to compute the answer.(Excel, Matlab and the z-score table)
Nassim Khaled (2020). Inverse of Normal Cumulative Distribution (https://www.mathworks.com/matlabcentral/fileexchange/40717-inverse-of-normal-cumulative-distribution), MATLAB Central File Exchange. Retrieved .
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