Since the angle is in radians, then s = rθ.

$\bf \textit{arc's length}\\\\
s=r\theta \quad 
\begin{cases}
r=4\\
s=8\pi 
\end{cases}\implies 8\pi =4\theta \implies \cfrac{8\pi }{4}=\theta \implies 2\pi =\theta$

4 0

4 years ago

A poll conducted in 2013 found that 52% of u.s. adult twitter users get at least some news on twitter.40. the standard error for

FinnZ [79.3K]

The 99% confidence interval for the population proportion is given by

$sample \ proportion \pm 2.575\times standard \ error$

Given that 52% = 0.52 is the standard proportion and the standard error is 2.4% = 0.024.

Therefore, the <span>99% confidence interval for the fraction of u.s. adult twitter users who get some news on twitter is given by

$0.52\pm2.575\times0.024=0.52\pm0.0618=(0.4582, \ 0.5818)$

</span>Therefore, the <span>99% confidence interval for the fraction of u.s. adult twitter users who get some news on twitter is 45.82% and 58.18%.

The interpretation of the confidence interval</span> is as follows: "We are 99% confident that the fraction of U.S. adult twiter users who get some news on twitter is between 45.82% and 58.18%.

3 0

4 years ago

Daleily bought 2 cookies for $1.25 each and a pack of 6 cupcakes for $3.99 1 point

ella [17]

Answer: yes the answer is $6.49!!

Step-by-step explanation:

all you have to do is multiply the money amounts by the item count, add both answers, and you get the sum!! Noice Job!!

3 0

4 years ago