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3 years ago

9. The Brightline train travels 204 miles in 3 hours, moving at a constant

1 answer:

8 0

The answer is D
3/204= 0.01470588
I know that is how much of an hour it will take to travel an hour so multiply that by the miles
544* 0.01470588= 8
8 Hours

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In a large population, 91% of the households have cable tv. A simple random sample of 144 households is to be contacted and the

vlada-n [284]

Answer with explanation:

We are given that $\hat{p}=0.91$

Sample size : $n=144$

The mean of the sampling distribution of the sample proportions is given by :-

$\mu_{\hat{p}}=p=0.91$

The mean of the sampling distribution of the sample proportions is <u>0.91</u>

The standard deviation of the sampling distribution of the sample proportions :

$\sigma_{\hat{p}}=\sqrt{\dfrac{p(1-p)}{n}}\\\\=\sqrt{\dfrac{0.91(1-0.91)}{144}}=0.0238484800354\approx0.0238$

Hence, the standard deviation of the sampling distribution of the sample proportions is <u>0.0238</u>

4 0

3 years ago

Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample

horrorfan [7]

Answer:

Confidence interval is 128±2.326 days (between 125.674 days and 130.326 days) in 90% confidence level

Step-by-step explanation:

Confidence interval can be calculated as M±ME where

M is the average pregnancy days of smoking women and
ME is the margin of error in 90% confidence level.

Margin of Error in 90% confidence level can be calculated using the formula:

ME= $\frac{z*s}{\sqrt{N} }$ where

z is the z-value in 90% confidence level (1.645)
s is the standard deviation of pregnancy length (16)
N is the sample size (128)

putting these numbers in the formula, we get:

ME= $\frac{1.645*16}{\sqrt{128} }$ =2.326

then confidence interval is 128±2.326 ( between 125.674 and 130.326 ) in 90% confidence level

5 0

3 years ago

Please help! Will give brainliest and 10 points!

Anestetic [448]

<h2>The answer is D. 54d + 2</h2><h3>Hope it helps!! </h3>

3 0

3 years ago

What is the domain if the function? Interval Notation.<br><br>Thank you for the help!

kramer

Interval notation:

−
∞
,
−
2
)
∪
(
−
2
,
2
)
∪
(
2
,
∞
)

Hope this help I haven’t done this in awhile

5 0

2 years ago

Subtract 6 from 4 times d

Sindrei [870]

Answer:

2(3 - 2d)

Step-by-step explanation:

All you need to do is factor out 2 from the original expression, so 6 - 4d.

4 0

3 years ago