Normal distribution finding P area

Normal distribution finding P area

pQ: let X be a continuous random variable with NORMAL DENSITY /p
p$$f(ì,ó(x)) = \frac{1}{\sqrt{2}ð}*ó *e^{−(x−ì)^2/ 2ó^2}$$/p
pWe know that $ì = 70$ and $ó = 2$./p pFind $P(68 lt;= X lt;= 74)$ and
$P(X gt;= 73)$: /p pmy approach is ...br Since above is normal
distribution.. /p p$P((a-ì)/ó lt;= Z lt;= (b-ì)/ó) = P(1 lt;= Z lt;= 2) =
P(Zlt;=2) - P(Zlt;=1)$ , so by the table 0.4772 - 0.3413 . /p pAm I wrong
? /p