All categories

3 years ago

Plsss help I need answers by today

Mathematics

1 answer:

pentagon [3]3 years ago

3 0

Answer:

E, A, F

Step-by-step explanation:

You might be interested in

The federal government would like to estimate the proportion of households in the U.S. population that own their own homes. A pi

netineya [11]

Answer:

1770

Step-by-step explanation:

We need to estimate number of households to be sampled to construct a 99% confidence interval.

Number of households to be sampled=n=?

$n=\frac{(z_{\frac{\alpha}{2} })^2 pq }{E^{2} }$

$z_{\frac{\alpha}{2} } =z_{\frac{\0.01}{2} }=z_{0.005 }=2.576$

The proportion can be estimated as

p=x/n.

We know that 24 out of 40 households owns their home.

so, x=24 and n=40.

p=24/40

p=0.6

q=1-p=1-0.6=0.4

pq=0.6*0.4=0.24

E=0.03

$n=\frac{(z_{\frac{\alpha}{2} })^2 pq }{E^{2} }$

$n=\frac{2.576^2(0.24)}{0.03^2}$

$n=\frac{1.5926}{0.0009}$

n=1769.56.

n=1770.

Thus, the number of households that need to be sampled are 1770.

3 0

3 years ago

What is the range of the function on the graph?

Tresset [83]

Answer:

All real numbers greater than or equal to 2

Step-by-step explanation:

The range is from bottom to top. Since it is a closed circle this includes 2

4 0

3 years ago

Please answer answer question

sertanlavr [38]

Answer:

156.6 m²

Step-by-step explanation:

To find the surface area of this pyramid, we need to find the area of the base and the sides.

The base triangle has a length of 9 and a height of 7.8. So:

$\frac{bh}{2} = \frac{9\cdot7.8}{2} = \frac{70.2}{2} = 35.1$

Now, the length of the sides are 9 and the height is 9. So:

$\frac{9\cdot9}{2} = \frac{81}{2} = 40.5$

Since there are 3 identical sides:

$40.5\cdot3=121.5$

Add the values:

$121.5+35.1=156.6$

Hope this helped!

7 0

3 years ago

What is the ordered pair to the equation x2 - y2 = 25

uranmaximum [27]

5²-0²=25

5 can represent x, making x² equal to 25

If 0 represents y, there will not be any change to the 25, fulfilling the equation given.

x= 5

y= 0

8 0

3 years ago

BRAINLIEST + POINTS!

sertanlavr [38]

Answer:

the correlation coefficient of the line of best fit is, 0.98247.

Step-by-step explanation:

Correlation Coefficient are used to find how strong relationship between the data. It expressed its values between +1 and -1. It is represented by r.

* if 0<r<1 indicates a strong positive relationship.

* -1<r <0 indicates a strong negative relationship.

* r=0 indicates no relationship at all.

The formula for this :

$r = \frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2-(\sum x)^2][n\sum y^2-(\sum y)^2]}}$

Given the data: (-3, -40) , (1, 12), (5, 72) and (7,137)

Here, n = 4

To calculate the correlation coefficient r;

Substitute the values of data in above formla of r , as shown in the Figure 1:

then;

$r=\frac{4\cdot 1451-(10)(181)}{[4\cdot84-(10)^2][4\cdot 256977 -(181)^2]}$

$r=\frac{5804-1810}{\sqrt{[336-100][102788 -32761]}}=\frac{3994}{\sqrt{[236][70027]}}$

$r=\frac{3994}{4065.26408} =0.98247$

Therefore, the correlation coefficient r is, 0.98247 (Positive relationship)

6 0

3 years ago