Find frac{3}{7} of 28

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.
$p?$
$\tilde{\chi }$
$s$
$\frac{s}{x}$
$x$

1) Evaluate without using a calculator.
$\sec (-\frac{\pi }{3})-\cot (-\frac{5\pi }{4})$
2) Evaluate without using a calculator.
$\cos \frac{\pi }{2}-\csc (-\frac{\pi }{2})$
3) Simplify the expression:
$\tan \beta \cot \beta$
4) Evaluate without using a calculator.
${\sin }^2{20}^{\circ }+\frac{1}{{\sec }^2{20}^{\circ }}$
5) Evaluate without using a calculator.
$\frac{\sin (-{40}^{\circ })}{\cos {50}^{\circ }}$
6) Evaluate without using a calculator.
$\sin {400}^{\circ }\sec (-{50}^{\circ })$
7) Find the exact value of all remaining trig functions
$\sin \theta =\frac{4}{5},\theta$ is acute

Datan asks you "Hey Yosief, I have a question for you, if I gives 4 chocolate bars to each child at my party, I will have 38 left. If I give 7 chocolate bars each, I will have 2 chocolate bars left. How many children were there at my birthday party?"

The time taken to finish 26.2 miles.
Given: 6 miles ${\displaystyle =25}$ minutes.

How do you simplify ${\displaystyle 12m+9-2m-16?}$

How to list all the factors of 70?

A killer whale has eaten 75 pounds of fish today. It needs to eat at least 140 pounds of fish each day A bucket holds 15 pounds of fish. Identify an inequality that represents how many more buckets z of fish the whale needs to eat?