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3 years ago

I need help!!!please tell me the answer!!!

Mathematics

1 answer:

Misha Larkins [42]3 years ago

4 0

Sorry wanna points bfbdjudi

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Solve for x<br> 4r – 9 – 6x = 21

ehidna [41]

Answer:

X= 30-4r/-6

Step-by-step explanation:

1. Move the 9 to the other side. (21+9=30)

2. subtract the 4r and move it to the other side (-6x=21-4r)

3. divide both sides by -6

5 0

3 years ago

Using the simple random sample of weights of women from a data set, we obtain these sample statistics: nequals45 and x overbar

Tomtit [17]

Answer: (141.1, 156.48)

Step-by-step explanation:

Given sample statistics : $n=45$

$\overline{x}=148.79\text{ lb}$

$\sigma=31.37\text{ lb}$

a) We know that the best point estimate of the population mean is the sample mean.

Therefore, the best point estimate of the mean weight of all women = $\mu=148.79\text{ lb}$

b) The confidence interval for the population mean is given by :-

$\mu\ \pm E$ , where E is the margin of error.

Formula for Margin of error :-

$z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given : Significance level : $\alpha=1-0.90=0.1$

Critical value : $z_{\alpha/2}=z_{0.05}=\pm1.645$

Margin of error : $E=1.645\times\dfrac{31.37}{\sqrt{45}}\approx 7.69$

Now, the 90% confidence interval for the population mean will be :-

$148.79\ \pm\ 7.69 =(148.79-7.69\ ,\ 148.79+7.69)=(141.1,\ 156.48)$

Hence, the 90% confidence interval estimate of the mean weight of all women= (141.1, 156.48)

3 0

3 years ago

A scuba diver reaches an elevation of -78 feet, which is a depth of 78 feet.

gavmur [86]

Answer:

true

Step-by-step explanation:

depth is how far down you are from the surface

6 0

3 years ago

Add parentheses 10+9×3-1×2 equal greater than 75

vitfil [10]

(10 + 9) x (3 - 1) x 2 = +75
19 x 2 x 2
76
76 > 75

5 0

3 years ago

A statue is 175 feet tall. if at a certain time of day a 6 foot tall person cast an 8 foot shadow, how long will the statues sha

xxMikexx [17]

If a 6 foot tall person cast an 8 foot shadow then the scale would be 4:3. So the statue will be aproximately 233,4 feet long (Sorry if I'm wrong)

8 0

3 years ago