Math Help - conf interval estimator 2

1. conf interval estimator 2

2. Originally Posted by samileo31
Have you reviewed this material in your classnotes and textbook? What have you tried? Where are you stuck?

3. i am not sure check it please------------

4. Originally Posted by samileo31
The confidence interval is $\overline{x} \pm 1.645 \times s_{\overline{x}}$