All categories

2 years ago

How many degrees are in 3pi/2 radians?

1 answer:

7 0

3pi/2*180/pi
so pi is cancelled with pi
3/2*180=270 degrees
when we have to convert from radians to degree we have this formulae
radians*180/pie

You might be interested in

Which fraction is between 1/2 and 2/2

Afina-wow [57]

The fraction between 1/2 and 2/2 is 1/4

5 0

3 years ago

The bicycle repair shop charged Devontae $34

vova2212 [387]

Answer: $42.4 dollars

Step-by-step explanation: PLZ PLZ PLZ MARK BRAINLIEST

4 0

3 years ago

Pls help asap! It’s due in one hour!!

AfilCa [17]

1. t = 7
2. t = 0
i think? although I’m not 100% sure

8 0

2 years ago

Worth 33 points each!!

gogolik [260]

Where x is the number of books sold, i is income, and c is cost:

c = 4x + 3500 ($4 per book plus the 3500 flat marketing fee)

i = 15x ($15 per book)

You are looking for the point where these intersect: the intersection is where the income is equal to the cost, and at any point after that the income is greater than the cost. So, set the equations equal to each other:

4x + 3500 = 15x

subtract 4x from both sides

3500 = 11x

divide both sides by 11

x = 318.181818

So, you would have to sell a minimum of 319 books in order to make a profit.

3 0

3 years ago

Read 2 more answers

12. Using the value of 0.538 for the proportion of those surveyed who said they exercise at least 30 minutes three or more days

ICE Princess25 [194]

Answer:

$ME=1.96\sqrt{\frac{0.538 (1-0.538)}{15235}}=0.00792$

The margin of error on this case is approximated $\pm 0.792\%$ who is very clos to the +1% reported by the Gallup.

Step-by-step explanation:

Assuming this previous info : "Results are based on telephone interview conducted as part of the Gallup-Healthways Well-Being Index survey June 1–30,2013, with a random sample of 15,235 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia.

For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±1 percentage point."

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".

The population proportion have the following distribution

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

Solution to the problem

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 estimated proportion on this case is $\hat p =0.538$ and n =15235, the margin of error is given by:

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

And if we replace we got:

$ME=1.96\sqrt{\frac{0.538 (1-0.538)}{15235}}=0.00792$

The margin of error on this case is approximated $\pm 0.792\%$ who is very clos to the +1% reported by the Gallup.

5 0

3 years ago