Question

see below

Answer 1

−1.64=(60−μ)/σ
and
1.96=(95−μ)/σ
solve for μ and σ

Answer 2

no one wants to do this because it is a pain
here is the answer
http://www.wolframalpha.com/input/?i=%E2%88%921.64%3D%2860%E2%88%92%CE%BC%29%2F%CF%83%2C+1.96%3D%2895%E2%88%92%CE%BC%29%2F%CF%83

Answer 3

\[-164\sigma =60-\mu\\
1.96\sigma =95-\mu\] you have to solve that system of equations
it is not impossible, just not much fun

Answer 4

\[\mu-1.64\sigma =60\\
\mu+1.96\sigma =95\] you can multiply the first equation by \(-1\) get
\[-\mu+1.64\sigma =-60\\
\mu+1.96\sigma =95\] then add them up

Answer 5

thank you very much!!