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3 years ago

It takes an average of 40 seconds to download a certain file, with a standard deviation of

1 answer:

5 0

The probability of spending more than 1 minute for this download is : Very Low or almost impossible.
Even after counting the standard deviation, the worst amount of time is about 45 seconds

hope this helps

You might be interested in

Which is the simplified form of -7+5-12?

sineoko [7]

Answer:

$- 14$

Step-by-step explanation:

$- 7 + 5 - 12 \\ ( - 7 + 5) - 12 \\ - 2 - 12 \\ = - 14$

hope this helps

brainliest appreciated

good luck! have a nice day!

8 0

3 years ago

Read 2 more answers

YThe Pew Research Center conducted a survey of 1007 adults and found that 85% of them know what Twitter is. Find a 90% confidenc

goblinko [34]

Answer:

The 90% confidence interval is $0.8315 < p < 0.8685$

Step-by-step explanation:

From the question we are told that

The sample size is n = 1007

The sample proportion is $\^ p = 0.85$

From the question we are told the confidence level is 90% , hence the level of significance is

$\alpha = (100 - 90 ) \%$

=> $\alpha = 0.10$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.645$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \sqrt{\frac{\^ p(1- \^ p)}{n}}$

=> $E =1.645 * \sqrt{\frac{0.85 (1- 0.85 )}{1007}}$

=> $E = 0.0185$

Generally 90% confidence interval is mathematically represented as

$\^ p -E < p < \^ p +E$

=> $0.85 -0.0185 < p < 0.85 + 0.0185$

=> $0.8315 < p < 0.8685$

6 0

3 years ago

$120; Markup: 35%<br><br>What's the final price? pls show how u got the answer...

Tju [1.3M]

Answer: 162

Step-by-step explanation:

So you will need to find the Markup. The original cost is $120.

Divide the number by 100 is 1.2. $1.2 is 1% of the $120.
Now times the number by 35. $1.2 x 35 is $42.
Finally, add the number. 120 + 42 = 162.

I hope this is the answer you are looking for.

4 0

3 years ago

Calculate the integral s f · ds, where s is the entire surface of the solid half ball x2 + y2 + z2 ≤ 1, z ≥ 0, and f = (x + 3y5)

SSSSS [86.1K]

The divergence theorem applies since $\mathcal S$ is a closed surface. We have

$\displaystyle\iint_{\mathcal S}\mathbf f(x,y,z)\cdot\mathrm d\mathbf S=\iiint_{\mathcal V}\nabla\times\mathbf f(x,y,z)\,\mathrm dV$

where $\mathcal V$ is the space enclosed by the surface $\mathcal S$ . The divergence of the given vector field is

$\nabla\times\mathbf f(x,y,z)=\dfrac{\partial(x+3y^5)}{\partial x}+\dfrac{\partial(y+10xz)}{\partial y}+\dfrac{\partial(z-xy)}{\partial z}=1+1+1=3$

So we can write the volume integral (in spherical coordinates) as

$\displaystyle3\iiint_{\mathcal V}\,\mathrm dV=3\int_{\varphi=0}^{\varphi=\pi/2}\int_{\theta=0}^{\theta=2\pi}\int_{\rho=0}^{\rho=1}\rho^2\sin\varphi\,\mathrm d\rho\,\mathrm d\theta\,\mathrm d\varphi=\frac{4\pi}3$

6 0

3 years ago

When can you add or subtract equations in a system to solve the system? when do you have to multiply first? Justify your answers

victus00 [196]

You must always use the order of operations also known as PEMDAS meaning multiplication and division come before adding and subtracting for example when solving 2+2÷2 if not follwing PEMDAS it is 2 When you do it the correct way using PEMDAS it will be 3

5 0

3 years ago