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user100 [1]
3 years ago
5

Ms Ratchett's math class averaged poorly on a test, so she gave them a retest. If all 30 students in the class scored 10 points

higher
on the retest, how would the MEAN of the retest scores differ from the MEAN of the scores on the first test?
The means would be the same.
The mean on the retest would be 3 points higher
The mean on the retest would be 10 points higher
The mean on the retest would be 13 points higher
Mathematics
2 answers:
Vlada [557]3 years ago
8 0

Answer:

C. The mean on the retest would be 10 points higher

Step-by-step explanation:

pentagon [3]3 years ago
7 0
The means would be 3 points higher
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4 years ago
A person standing 28 feet from a street light casts a shadow as shown. What is the height h of the street light? Assume the tria
Mademuasel [1]

Answer:

20 ft

Step-by-step explanation:

Since we assume the triangles are similar, therefore, the ratio of their corresponding sides will be the same.

Height of the bigger triangle corresponds to height of the person

Distance of the person from street light + shadow of the person corresponds to the length of the shadow of the person

Therefore, the ratio of the corresponding sides of the triangles would be:

Height of bigger triangle : height of the person = Distance of the person from street light + shadow of the person : length of the shadow of the person

Thus:

h : 6 = 28 + 12 : 12

h : 6 = 40 : 12

h/6 = 40/12

Cross multiply

12h = 40*6

12h = 240

Divide both sides by 12

12h/12 = 240/12

h = 20

Height of the street light = 20 ft

3 0
3 years ago
Efficiency is a long term measure of how well organization uses it's resources true or false?​
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Answer: That is true , it could mean alot of things good and bad , but mostly good. How efficient is the company on disposing waste.How efficient is the company good on firing someone after they made a mistake. Sad but true

Step-by-step explanation:

3 0
3 years ago
What are the three undifined terms in geometry
Whitepunk [10]

Three undefined terms in geometry are

1 - Point

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2 - Line

A line has no thickness and its length extends in one measurement and goes on in both directions forever. A line is named by a single lowercase letter or by any two points on the line.

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8 0
3 years ago
Find the area.???????
Fed [463]

well, we can check the units right off the grid.


so, below the x-axis, we have a rectangle, is a 10x3, so it has an area of 10*3.


above the x-axis we have a trapezoid, it has to parallel sides or bases, top is 6 units, bottom base is 10 units, and it has an altitude of 2.


we can just get the area of both, sum them up, and that's the area of the figure.


\bf \textit{area of a trapezoid}\\\\
A=\cfrac{h(a+b)}{2}~~
\begin{cases}
a,b=\stackrel{bases}{parallel~sides}\\
h=height
\end{cases}\\\\
-------------------------------\\\\
\stackrel{rectangle}{(10\cdot 3)}~~+~~\stackrel{trapezoid}{\cfrac{h(a+b)}{2}}\implies \stackrel{rectangle}{(10\cdot 3)}~~+~~\stackrel{trapezoid}{\cfrac{2(6+10)}{2}}
\\\\\\
30+16\implies 46

4 0
4 years ago
Read 2 more answers
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