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3 years ago

What is the value ofx?95Answer:

Mathematics

1 answer:

Sladkaya [172]3 years ago

7 0

The value of 'x' is 25.

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Cómo se expresa en notación científica 1254

lisov135 [29]

Answer:

1.254 * 10^3

Step-by-step explanation:

1254 = 1.254 * 1000 = 1.254 * 10^3

7 0

3 years ago

A random sample of 25 glass sheets is obtained and their thicknesses are measured. The sample mean is x= 3.54 mm and sample stan

lisabon 2012 [21]

Answer: (3.46, 3.62)

Step-by-step explanation:

The formula to find the confidence interval for population mean is given :-

$\overline{x}\ \pm\ t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

, where n = sample size.

$t_{\alpha/2}$ = Two-tailed t-value for significance level of $(\alpha)$ and degree of freedom df= n-1.

$s$ = sample standard deviation.

As per given , we have

$\overline{x}= 3.54$ mm

s= 0.20 mm

n= 25

Significance level $=\alpha=1-0.95=0.05$

Since population standard deviation is not given , it means the given problem has t- distribution.

Two-tailed t-value for significance level of $(0.05)$ and degree of freedom df= 24:

$t_{\alpha/2\ ,df}=t_{0.025,\ 24}=2.0639$

95% Confidence interval for population mean:

$3.54\ \pm\ (2.0639)\dfrac{0.20}{\sqrt{25}}$

$=3.54\ \pm\ (2.0639)\dfrac{0.20}{5}$

$=3.54\ \pm\ (2.0639)(0.04)$

$=3.54\ \pm\ 0.082556$

$=(3.54- 0.082556,\ 3.54+ 0.082556 )=(3.457444,\ 3.622556)\approx(3.46,\ 3.62)$

Hence, the 95% two-sided confidence interval for the mean glass thickness = (3.46, 3.62)

7 0

4 years ago

A faucet in a large tank can fill the tank in 12 hours. However, there is a hose in the tank which would be able to empty the ta

Kruka [31]

It would take the faucet 18 hours to fill the tank because 18/12=1.5. That means it will be 1.5 times slower to fill the tank up with the hose on. 1.5*12=18.

7 0

4 years ago

I need help on #12 please

Svetach [21]

I think it's 330 I don't really know

7 0

4 years ago

What is the volume of the prism picture below

oksano4ka [1.4K]

Answer:

i think its 18.59

Step-by-step explanation:

3 0

4 years ago