\begin{tabular}{|l|l|l|} \hline 1 & household_key & ID for each household \\ \hline 2 & sales.sum\$ & Total \$ values spent by each household in the store \\ \hline 3 & num.purchases & Total number of purchases from each household \\ \hline 4 & days.sincelast & Number of days since last purchase \\ \hline 5 & & \\ \hline 6 & & \\ \hline \end{tabular} . This data file contains four columns, 100 rows. Each row has information about one customer. The definition of each variable in the data is listed in a separate sheet "Variables". QuEstion 1 Please read the excel equations in the columns E,F and G, and try to understand how we can leverage excel to define the scores. Use your understanding to fill in the tables below.