hi, in my lecture notes, it says:

given, standard deviation of 0.1

$\displaystyle P(Z< \frac{xbar -0.3}{0.1/\sqrt{n}}) = 0.95 $

$\displaystyle \frac{xbar -0.3}{0.1/\sqrt{n}} = 1.645 $

this is a dumb question but how did they get to the second step?