Q$1($f $\stackrel{}{x}=34,n=38$ and $x^2=12.$ Find

a$($find a point estimator for the population mean $.$

b$($find $99\%$ confidence interval for the mean $.$

Q$2($if $(2\mathrm{.}4,6\mathrm{.}3)$ is a $90\%$ confidence interval for $,$ calculate the margin of error $E.$