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3 years ago

HELP i need to find area there is a rectangle and trapezoid

Mathematics

1 answer:

Dovator [93]3 years ago

4 0

Answer:

You need to times 5,6,10,7, and 15

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Lucille has a collection of more than 500 songs on her phone that have a mean duration of 215 seconds and a standard deviation o

DochEvi [55]

Answer:

The mean of the sampling distribution is of 215 seconds and the standard deviation is 5.

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

All songs

Mean 215 seconds, standard deviation 35 seconds

Sample

Mean 215, standard deviation $s = \frac{35}{\sqrt{49}} = 5$

The mean of the sampling distribution is of 215 seconds and the standard deviation is 5.

8 0

4 years ago

Read 2 more answers

<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bx%20%7B%7D%5E%7B2%7D%20-%204%20%7D%7B%20%5Csqrt%7Bx%20%7B%7D%5E%7B2%7D%20-%206x%2

Nimfa-mama [501]

First of all, we can observe that

$x^2-6x+9 = (x-3)^2$

So the expression becomes

$\dfrac{x^2-4}{\sqrt{(x-3)^2}} = \dfrac{x^2-4}{|x-3|}$

This means that the expression is defined for every $x\neq 3$

Now, since the denominator is always positive (when it exists), the fraction can only be positive if the denominator is also positive: we must ask

$x^2-4 \geq 0 \iff x\leq -2 \lor x\geq 2$

Since we can't accept 3 as an answer, the actual solution set is

$(-\infty,-2] \cup [2,3) \cup (3,\infty)$

7 0

3 years ago

Garrrrryy <br><br> no need to show work <br> two questions <br> thankks

irakobra [83]

1. $x^2-x-72=0$
$\Delta=(-1)^2-4*1*(-72)=1+288=289$
$\sqrt{\Delta}=17$
$x_1=\frac{1-17}{2}=-8$
$x_2=\frac{1+17}{2}=9$

2. $f(x)=x^2+12x+20$
$\Delta=144-80=64$
$\sqrt{\Delta}=8$
$x_1=\frac{-12-8}{2}=-10$
$x_2=\frac{-12+8}{2}=-2$

8 0

4 years ago

Um número é o quíntuplo do outro e a soma dos dois é 54. De acordo com essas informações, podemos afirmar que a diferença entre

NNADVOKAT [17]

Answer:

Step-by-step explanation:

A partir das informações fornecidas, as seguintes equações podem ser modeladas:

$X=5Y\\X+Y=54\\$

Resolvendo o sistema:

$Y+5Y=54\\Y=9\\X=9*5=45$

A diferença entre eles é:

$X-Y=45-9\\X-Y=36$

A diferença entre o maior número e o menor número é 36.

7 0

3 years ago

Which table represents a nonlinear function?

klasskru [66]

I've Answered a question like this in the past (though it was linear) examples of a linear table are x:1234
and then y: -3 -5 -7 -9. so for a non linear table it would have to be odd numbers x:1234
y:3 6 12 24
remember my example and dont use 1234, -3 -5 -7 -9 ok?

5 0

4 years ago