Question 355635
In other words what is the area of the distribution curve between ({{{-1.2*sigma}}},{{{ 1.2*sigma}}}).
Find {{{P(1.2)=0.11507}}}.
That's the area of the region up to {{{1.2*sigma}}}.
The area from there to {{{x=0}}} would then be,
{{{A=0.5-0.11507}}}
{{{A=0.38493}}}
Twice that area would give us the area from ({{{-1.2*sigma}}},{{{ 1.2*sigma}}}).
{{{A=0.769861}}}