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exis [7]
3 years ago
9

Charles wants to find out if the students in foreign language classes spend more time in class speaking in English or in the for

eign language they are studying. Charles first gets class lists of all students taking foreign language classes. He then chooses 10 students from each different language class to survey. Which best explains why the sample he chose may not be a representative sample?
Mathematics
2 answers:
Hunter-Best [27]3 years ago
6 0
The samples he chose may not be a representative sample because the number of students per foreign language class may not be the same. One class may have a very large number of students while another may have only a few. Taking equal number of students per class is not a representative sample.<span />
iVinArrow [24]3 years ago
4 0

Answer:

The way the sample was chosen may overrepresent or underrepresent students taking certain language classes.

Step-by-step explanation:

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Answer:

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3 0
3 years ago
Can someone please help me with this? Thank you!
kkurt [141]

Answer:

\left[\begin{array}{ccc}-25&\dfrac{75}{2}&-\dfrac{25}{2}\end{array}\right]

Step-by-step explanation:

In the first equality

5\times \left[\begin{array}{cc}-1&2\\4&8\end{array}\right] =\dfrac{2}{5}m\times \left[\begin{array}{cc}-1&2\\4&8\end{array}\right],

the matrices in both parts are the saem. The equality will be true if the same matrices are multiplied by the same numbers, so

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For the second equality

(H+[1\ 4\ -2])+[3\ 2\ -6]=[-2\ 3\ -1]+([1\ 4\ -2]+[3\ 2\ -6]),

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Hence,

m\times H=\dfrac{25}{2}\times [-2\ 3\ -1]=\left[\begin{array}{ccc}-25&\dfrac{75}{2}&-\dfrac{25}{2}\end{array}\right]

7 0
2 years ago
Use substitution to solve 1-2.<br><br> 3x – 3y = 9<br> x= 7 – 3y
kondaur [170]

Answer:

Solutions are x =4 and y = 1

Step-by-step explanation:

3x-3y =9

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now substitute y =1 in x equation,

x=7-3(1)\\x=7-3\\x=4

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8 0
3 years ago
Sally was able to drive
aliina [53]
Remark
Average in this case does not mean you take (s1 + s2)/2. What average speed  means is Total Distance / Total Time.

Formula
Average speed(s) = Total Distance / Total Time

Givens
Total Distance = 252 + 30 = 282 miles
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Substitute and Solve
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The other facts are not used. 
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2 years ago
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