You measure 40 backpacks' weights, and find they have a mean weight of 46 ounces. Assume the population standard deviation is 4.9 ounces. Based on this, construct a 95% confidence interval for the true population mean backpack weight. (Note you will use the z distribution for your critical value since the population standard deviation is given.)
Write your answer in the form of point estimate$\pm$margin of error. Give your answers as decimals, to two places.
\boxed{} $\pm$ \boxed{} ounces
Write your answer using inequality notation.
\boxed{} $< \mu < $\boxed{}
