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vodomira [7]
2 years ago
9

PLEASE HELP ill give BRAINLIST

Mathematics
1 answer:
weqwewe [10]2 years ago
8 0

Answer:

0.02562 poti sami dai coroana pls

Step-by-step explanation:

You might be interested in
What is 10.3% of 853.93km
kolezko [41]
The answer is: 87.95

In order to make the percent a decimal, we move the decimal two spaces back.

To solve this we could do 853.93 x .103

Hope this helps!
6 0
3 years ago
Suppose that insurance companies did a survey. They randomly surveyed 400 drivers and found that 320 claimed they always buckle
nirvana33 [79]

Answer:

i) ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

And replacing we got:

ME= 1.96*\sqrt{\frac{0.8 (1-0.8)}{400}} =0.0392

ii) Lower = 0.8-0.0392= 0.7608

Upper = 0.8 +0.0392= 0.8392

Step-by-step explanation:

Notation and definitions

X=320 number of people that claimed always buckle up.

n=400 random sample taken

\hat p=\frac{320}{400}=0.8 estimated proportion of people that claimed always buckle up

p true population proportion of people that claimed always buckle up

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

Solution to the problem

Part i

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The confidence interval for the mean is given by the following formula:  

\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

The margin of error is given by:

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

And replacing we got:

ME= 1.96*\sqrt{\frac{0.8 (1-0.8)}{400}} =0.0392

Part ii

And the confidence interval would be given by:

Lower = 0.8-0.0392= 0.7608

Upper = 0.8 +0.0392= 0.8392

6 0
3 years ago
I NEED HELP!!!! I am currently reviewing for my last test, and i am struggling with this problem. I KNOW WHAT THE ANSWER IS BUT
stira [4]

Answer:

336\:\mathrm{ft^2}

Step-by-step explanation:

The total surface area simply consists of three rectangles and two triangles. To find the total surface of the figure, find the sum of each of the shapes that make up the outside of the figure:

2 triangles: 2 x 1/2 x 6 x 8 = 48 ft^2

First rectangle: 6 x 12 = 72 ft^2

Second rectangle: 8 x 12 = 96 ft^2

Third rectangle: 10 x 12 = 120 ft^2

*Note: One of the dimensions is in yards, so make sure to convert it to ft (1 yd = 3ft)

Thus, the total surface area of the figure is 48+72+96+120 = 336 ft^2.

4 0
3 years ago
Question 5 of 20
Ymorist [56]

Answer:

B

Step-by-step explanation:

The first term is - 9 and the common difference is 6.

Formula is - 9+(n-1)*6

3 0
2 years ago
Please help!!! I'll give brainliest, if you help U_U<br> Tysm for the help xD
Valentin [98]

Answer:

x is 122

Step-by-step explanation:

7 0
2 years ago
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