(Solved): A student performed a titration to determine the exact concentration of NaOH(aq). The titration was ...

A student performed a titration to determine the exact concentration of $\mathrm{NaOH}(\mathrm{aq})$. The titration was performed against a standard $0.1000\mathrm{M}$ $\mathrm{HCl}$ (aq) solution. Phenolphthalein indicator was used. The following endpoint volumes were recorded by the student in units $\mathrm{mL}$ : Calculate the standard deviation for the above data set. Assume that there is no outlier. Provide your answer to the correct number of decimal places and without units.