Do \frac{9}{24} and \frac{15}{40} form a proportion?

Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type.
$\begin{array}{|ccccccc|}\hline 11.8& 7.7& 6.5& 6.8& 9.7& 6.8& 7.3\\ 7.9& 9.7& 8.7& 8.1& 8.5& 6.3& 7.0\\ 7.3& 7.4& 5.3& 9.0& 8.1& 11.3& 6.3\\ 7.2& 7.7& 7.8& 11.6& 10.7& 7.0\\ \hline\end{array}$
a) Calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. $[Hint.?x_j=219.5.]$ (Round your answer to three decimal places.)
MPa
State which estimator you used.
$x$
$p?$
$\frac{s}{x}$
$s$
$\tilde{\chi }$
b) Calculate a point estimate of the strength value that separates the weakest $50\mathrm{\%}$ of all such beams from the strongest $50\mathrm{\%}$.
MPa
State which estimator you used.
$s$
$x$
$p?$
$\tilde{\chi }$
$\frac{s}{x}$
c) Calculate a point estimate of the population standard deviation ?. $[Hint:?x_{i}2=1859.53.]$ (Round your answer to three decimal places.)
MPa
Interpret this point estimate.
This estimate describes the linearity of the data.
This estimate describes the bias of the data.
This estimate describes the spread of the data.
This estimate describes the center of the data.
Which estimator did you use?
$\tilde{\chi }$
$x$
$s$
$\frac{s}{x}$
$p?$
d) Calculate a point estimate of the proportion of all such beams whose flexural strength exceeds 10 MPa. [Hint: Think of an observation as a "success" if it exceeds 10.] (Round your answer to three decimal places.)
e) Calculate a point estimate of the population coefficient of variation $\frac{?}{?}$. (Round your answer to four decimal places.)
State which estimator you used.
$p?$
$\tilde{\chi }$
$s$
$\frac{s}{x}$
$x$

Ms. Donahue rents a space in the mall for her store. The mall owner just increased the amount of her rent. As a result, Ms. Donahue decided to raise all the prices in her store by 5%. What is the new price of an item that had an original price of $80?
A. $84
B. $85
C. $120
D. $160

Kelly has 4x as much money as Joey. After Kelly uses some money to buy a racquet, and Joey uses ${\displaystyle \mathrm{\$}30}$ to buy shorts, Kelly has twice as much money as Joey. If Joey started with ${\displaystyle \mathrm{\$}98}$, how much money does Kelly have? what does the racquet cost?

The solution of the given expression.
Given: ${\displaystyle 5h=33}$

To find the U.S dollar received against of $350 Canadian dollar.

To write:
The two other true proportions for ${\displaystyle \frac{6}{18}=\frac{1}{3}}$.

Alex wants to calculate his term mark in mathematics. It is to be based on 6 assignments, all equally weighted. He scored 82%,74%,66%, 83%, and 75% on his first five assignments. What mark will Alex need on his sixth assignments in order to achieve a term mark of 80%?