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natta225 [31]
3 years ago
10

A dance student wants to know the favorite type of dance class for students at The Dance Academy. She surveys each student in he

r ballet class. In which way could the results of her survey be most improved?
Mathematics
2 answers:
Fiesta28 [93]3 years ago
5 0
She only asked the students in her ballet class, which is probably biased toward ballet. She should survey everyone in The Dance Academy. That way, the answers won't be biased.
Korolek [52]3 years ago
4 0

Answer:

Step-by-step explanation:

Given that a dance student wants to know the favorite type of dance class for students at The Dance Academy. She surveys each student in her ballet class.

When she surveys only students in ballet class, she is taking a biased sample who already decided to pursue ballot dance.

Hence the survey is not correct and will not give accurate results.

She must select equal number of random students from each dance group and conduct the survey to get a more reliable result.

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geniusboy [140]

Answer:

C

Step-by-step explanation:

11 times 11 = 121

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11 times 13 = 143

7 0
3 years ago
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Answer:How much tip do you leave for $30?

Tip on $30

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Step-by-step explanation:

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3 years ago
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Please ΔEFU ~ ΔVWU. Find the length of UF.
koban [17]
<h3>Answer: UF = 11</h3>

=======================================================

Explanation:

In EFU, we see that EU are the first and last letters. In VWU, we see that VU are the first and last letters. This order is important to be able to pair EU with VU

So EU/VU is one ratio

The other ratio is UF and UW, which are the last two letters of EFU and VWU respectively. So the other ratio is UF/UW

Set the ratios equal to each other and solve for x

EU/VU = UF/UW

7/35 = x/55

7*55 = 35*x ... cross multiply

385 = 35x

35x = 385

x = 385/35 .... divide both sides by 35

x = 11

UF = 11

------------

Or you could note how UV = 35 is exactly 5 times larger compared to EU = 7

That must mean WU = 55 must also be 5 times larger compared to UF = x

So,

WU = 5*UF

55 = 5x

5x = 55

x = 55/5

x = 11

UF = 11

This is similar to the previous section because UV/EU = 35/7 = 5 is the scale factor.

4 0
3 years ago
The width of a rectangle is two cm less than 8 times the length. The perimeter is 88 cm. What is the width and length of the rec
kati45 [8]

Let's the length to be x,

then the width is 8x - 2.

Perimeter of a rectangle = 2*Width + 2*Length

Perimeter of the rectangle = 2(8x-2) + 2x = 16x - 4 + 2x = 18x - 4

Ar the same time, Perimeter of the rectangle = 88.

So, we can write

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x= 42/9 cm (length) or ≈ 4.67 cm (length)

8x - 2 = 8*42/9 - 2 ≈ 35.33 cm (width)


6 0
3 years ago
Michael uses a uniform probability model for an experiment using a deck of 45 cards. There are 15 blue card, 15 red cards, and 1
vampirchik [111]

Answer:

<em>P</em> = 2/3

Step-by-step explanation:

45 cards in all

15 blue

15 red

15 green

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Since the total is 45, this is how many 30 will be out of.

30 out of 45 = 30/45

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45 ÷ 15 = 3

30/45 = 2/3

6 0
2 years ago
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