Why are measures of central tendency essential to descriptive statistics?

CNBC recently reported that the mean annual cost of auto insurance is $998. Assume the standard deviation is $298.
Find the probability that a single randomly selected value is less than $985.
${\displaystyle P\left(X<985\right)=}$?
Write your answers as numbers accurate to 4 decimal places.

Gastroenterology
We present data relating protein concentration to pancreatic function as measured by trypsin secretion among patients with cystic fibrosis.
If we do not want to assume normality for these distributions, then what statistical procedure can be used to compare the three groups?
Perform the test mentioned in Problem 12.42 and report a p-value. How do your results compare with a parametric analysis of the data?
Relationship between protein concentration $(mg/mL)$ of duodenal secretions to pancreatic function as measured by trypsin secretion:
$[U/\frac{kg}{hr}]$
Tapsin secreton [UGA]
$\le 50$
$\begin{array}{|cc|}\hline \text{Subject number}& \text{Protetion concentration}\\ 1& 1.7\\ 2& 2.0\\ 3& 2.0\\ 4& 2.2\\ 5& 4.0\\ 6& 4.0\\ 7& 5.0\\ 8& 6.7\\ 9& 7.8\\ \hline\end{array}$
$51-1000$
$\begin{array}{|cc|}\hline \text{Subject number}& \text{Protetion concentration}\\ 1& 1.4\\ 2& 2.4\\ 3& 2.4\\ 4& 3.3\\ 5& 4.4\\ 6& 4.7\\ 7& 6.7\\ 8& 7.9\\ 9& 9.5\\ 10& 11.7\\ \hline\end{array}$
$>1000$
$\begin{array}{|cc|}\hline \text{Subject number}& \text{Protetion concentration}\\ 1& 2.9\\ 2& 3.8\\ 3& 4.4\\ 4& 4.7\\ 5& 5.5\\ 6& 5.6\\ 7& 7.4\\ 8& 9.4\\ 9& 10.3\\ \hline\end{array}$