The Same Police Department Decided to Reward Officers for Low

The same police department decided to reward officers for low rates of citizen complaints. Officers falling in the lower 20% (for the year 2015) will receive two additional paid days off for the year 2016.
a. Compute the mean.
b. Compute the standard deviation.
c. Compute the z scores for every individual officer.
d. Indicate the area under the normal curve (AUC) listed in the z-score table.
e. Indicate the percent ranking for each police officer.
f. List the officer IDs of the individuals who will receive two additional paid days for the year 2016.
$$\begin{array} { | c | c | } \hline \text { Officer ID } & \begin{array} { c } \text { No. of citizen } \\\text { complaints/2015 }\end{array} \\\hline 5556 & 1 \\\hline 5557 & 9 \\\hline 5558 & 3 \\\hline 5559 & 20 \\\hline 5560 & 14 \\\hline 5561 & 8 \\\hline 5562 & 5 \\\hline 5562 & 21 \\\hline 5562 & 0 \\\hline 5563 & 11 \\\hline 5564 & 0 \\\hline 5565 & 6 \\\hline 5566 & 15 \\\hline 5567 & 9 \\\hline 5568 & 4 \\\hline\end{array}$$