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motikmotik
2 years ago
13

A research group is on a college campus and is conducting a survey regarding the coffee consumption of college students in Ameri

ca. They randomly select three sample groups of 100 registered students to complete their survey, which asks the students to identify the average number of 8-ounce cups of coffee they consume each day. The results of the three sample groups are shown in the table below.
0 1 2 3 4+
Sample #1 38 19 26 16 1
Sample #2 32 14 37 15 2
Sample #3 41 22 31 6 0
One researcher looked at the results and made the following inference: "More college students don't drink coffee than do." Is this a valid conclusion? Explain your reasoning using complete sentences.
Mathematics
2 answers:
Anika [276]2 years ago
8 0
D is the answer to your question
ololo11 [35]2 years ago
6 0

Answer:

it is D because my teacher and I did a  sample test and these were one of the questions plus I've seen people with the same answer for this question. take my word for it

Step-by-step explanation:

hope this helps :D (pls brainliest

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what is f(x) = 2x2 28x – 5 written in vertex form? a.f(x) = 2(x 7)2 – 19 b.f(x) = 2(x 7)2 – 103 c.f(x) = 2(x 14)2 – 14 d.f(x) =
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2x²+28x-5=2(x²+2*7x+49)-5-2*49=2(x+7)²-103
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5 0
3 years ago
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Please help me with this
Andru [333]

Answer:

friend correct answer is 4/13

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 I’m probably wrong but I Think its isometric.

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Angle α lies in quadrant II , and tan α = <img src="https://tex.z-dn.net/?f=-%5Cfrac%7B12%7D%7B5%7D" id="TexFormula1" title="-\f
Hunter-Best [27]

Since \alpha lies in quadrant II and \beta lies in quadrant IV, we expect \sin\alpha>0, \cos\alpha, and \sin\beta.

Recall the Pythagorean identities,

\sin^2x+\cos^2x=1\iff1+\cot^2x=\csc^2x\iff\tan^2x+1=\sec^2x

It follows that

\sec\alpha=\dfrac1{\cos\alpha}=-\sqrt{\tan^2\alpha+1}=-\dfrac{13}5\implies\cos\alpha=-\dfrac5{13}

\sin\alpha=\sqrt{1-\cos^2\alpha}=\dfrac{12}{13}

\sin\beta=-\sqrt{1-\cos^2\beta}=-\dfrac45

Recall the angle sum identity for sine:

\sin(\alpha+\beta)=\sin\alpha\cos\beta+\sin\beta\cos\alpha

So we have

\sin(\alpha+\beta)=\dfrac{12}{13}\dfrac35+\left(-\dfrac45\right)\left(-\dfrac5{13}\right)=\boxed{\dfrac{56}{65}}

4 0
3 years ago
Work out the size of angle x
umka21 [38]

Answer:

47°

Step-by-step explanation:

it this from mathwatch

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