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Mathematics

1 answer:

harina [27]3 years ago

6 0

I answered both questions and explained it. hope it helps :)

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Please answer this math question!! ONLY IF YOU KNOW THE ANSWER! 40 points and brianliest!

anastassius [24]

Let A= the sky is red at night
let B= the weather will be nice the next day

Since this is based on Conditional Probability,

P(B|A)
This is read: The probability that the weather iss nice the next day GIVEN the sky is red at night.

3 0

4 years ago

Find the length of l on the curve r(t)=5cos(3t)i-5sin(3t)j+3tk over the interval [3,7]

stealth61 [152]

$\mathbf r(t)=5\cos3t\,\mathbf i-5\sin3t\,\mathbf j+3t\,\mathbf k$
$\mathrm d\mathbf r(t)=\mathbf r'(t)\,\mathrm dt=(-15\sin3t\,\mathbf i-15\cos3t\,\mathbf j+3\,\mathbf k)\,\mathrm dt$

$\displaystyle\int_C\mathrm d\mathbf r(t)=\int_{t=3}^{t=7}\|\mathbf r'(t)\,\mathrm dt\|=\int_{t=3}^{t=7}\sqrt{225\sin^23t+225\cos^23t+9}\,\mathrm dt$
$=\displaystyle3\sqrt{26}\int_{t=3}^{t=7}\mathrm dt$
$=12\sqrt{26}$

4 0

4 years ago

<img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B13%7D%20" id="TexFormula1" title=" \sqrt{13} " alt=" \sqrt{13} " align="absmiddle

Fed [463]

3.605
is the answer.

8 0

3 years ago

How many permutations are there of jack, queen, king, ace

vfiekz [6]

$\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad _4P_1=\cfrac{4!}{(4-1)!}$

4 0

4 years ago

About 78% of the US, population claims that they visit the dentist at least once a year. simple random sample of 200 people is s

Blababa [14]

Answer:

D) 0.78, 0.029

Step-by-step explanation:

Central Limit Theorem:

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean $\mu = p$ and standard deviation $s = \sqrt{\frac{p(1-p)}{n}}$