Z Confidence Interval Online Calculator
You can see a sample solution below. Enter your data to get the solution for your question
$$ \displaylines{\\ \\ \mu = 24.0
\\ \\ \sigma = 2
\\ \\ n = 34
\\ \\ Z\;for\;95.0\;\%\;confidence\;is\;1.959964
\\\;\\Formula\;for\;confidence\;interval\;
\;CI=
\mu \pm \frac{z* \sigma }{ \sqrt{n} }
\\ \\ \Rightarrow
24.0 \pm \frac{1.959964*2}{\sqrt{34} }
\\ \\ \Rightarrow
24.0 \pm 0.672262
\\ \\ \Rightarrow
\mathbf{\color{Red}{23.327738}} \leq \mu \leq \mathbf{\color{Red}{24.672262}}
} $$