Question 353733
{{{z=(x-mu)/sigma}}}
{{{-1=(63-mu)/sigma}}}
{{{1.5=(93-mu)/sigma}}}
.
.
1.{{{-sigma+mu=63}}}
2.{{{1.5*sigma+mu=93}}}
Subtract eq. 1 from eq. 2,
{{{1.5*sigma+mu+sigma-mu=93-63}}}
{{{2.5*sigma=30}}}
{{{highlight(sigma=12)}}}
Then use either equation to solve for {{{mu}}}.
{{{-12+mu=63}}}
{{{highlight(mu=75)}}}