All categories

4 years ago

How do you change your level like mine says middle school but I don't know how to change it?

2 answers:

8 0

Click on your icon at the top right of the screen and then click edit profile. Then click edit preferences. From there you can choose your level. Don't forget to click the save preferences button after you change your level.

Anon25 [30]4 years ago

7 0

I had the same problem for a while XD

You might be interested in

The statue of liberty is 305.5 feet tall from the foundation of it pedestal to the top of its torch Isla is building a model of

Effectus [21]

Answer: The actual model is 3.055 feet tall.

Step-by-step explanation:

Given: The statue of liberty is 305.5 feet tall from the foundation of it pedestal to the top of its torch .

The height of the model of the statue = $\dfrac{1}{100}\times\text{ (Height of actual model)}$

$=\dfrac{1}{100}\times305.5\\\\=3.055\text{ feet}$

Hence, the actual model is 3.055 feet tall.

8 0

3 years ago

Shau-uen solve the equation 18.5w+6.5w-2.8w=149.1 Her work is shown below

Ghella [55]

The answer is

C.- step 3

5 0

3 years ago

Read 2 more answers

Tina works for a medical technology company in sales. She travels to doctors' offices and offers them a suite of software relate

sesenic [268]

Answer: b. 1.94

Step-by-step explanation:

For binomial distribution model , the formula to find standard deviation is given by :-

$\sigma=\sqrt{np(1-p)}$

Given : The portability that the offices she visits will eventually purchase her product: p=0.25

The number of offices she visited = 20

We assume that the binomial is an appropriate model for the number of offices that make a purchase.

Then, to find the distance of the possible number of sales Tina could observe from the overall mean number of sales we find standard deviation.

$\sigma=\sqrt{np(1-p)}\\\\=\sqrt{20(0.25)(0.75)}\\\\=\sqrt{3.75}=1.9364916731\approx1.94$

Hence, the correct answer is option (b).

5 0

3 years ago

Suppose the weights of tight ends in a football league are normally distributed such that σ2=400. A sample of 11 tight ends was

AlladinOne [14]

Answer:

$217.636-1.96\frac{20}{\sqrt{11}}=205.817$

$217.636+1.96\frac{20}{\sqrt{11}}=229.455$

So on this case the 95% confidence interval would be given by (205.82;229.46)

Step-by-step explanation:

Assuming the following data: Weight 150 169 170 196 200 218 219 262 269 270 271

Previous concepts

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".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma= \sqrt{400}= 20$ represent the population standard deviation

n=11 represent the sample size

Solution to the problem

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

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

In order to calculate the mean we can use the following formula:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$ (2)

The mean calculated for this case is $\bar X=217.636$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$