The Table Below Shows the Sales Per Day at a Grocery

Essay

The table below shows the sales per day at a grocery store over a period of a week. Calculate the z-score for sales on Day 4. $\begin{array}{|c|l|}\hline \text { Day } & \begin{array}{l}\text { Sales per day in } \\\text { \$(Xi) }\end{array} \\\hline 1 & 5000 \\\hline 2 & 5304 \\\hline 3 & 6430 \\\hline 4 & 7889 \\\hline 5 & 5333 \\\hline 6 & 6109 \\\hline 7 & 6734 \\\hline\end{array}$