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Nataly_w [17]
3 years ago
6

Help me asaap please

Mathematics
2 answers:
Citrus2011 [14]3 years ago
4 0
The one you have selected is correct
sdas [7]3 years ago
3 0

Answer:

tHE FIRST OPTION

Step-by-step explanation:

A colon is representative of a ratio

for example

1:2 is a ratio

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There were 13 original states. there are now 50 states what fraction of states are the original states
Olenka [21]

The solution is attached as a word file

Download doc
3 0
2 years ago
5. Find the surface area of the cone. Round to<br> the nearest hundredth.<br> 2 ft<br> 6 ft
den301095 [7]

Answer:

52.3m^2

Step-by-step explanation:

Use these formulas

A=\pi rl+\pi r^2\\l=\sqrt{r^2+h^2}

Now solve

A=\pi r(r+\sqrt{h^2+r^2} )\\=\pi *2*(2\sqrt{6^2+2^2} )\\=52.3m^2

4 0
3 years ago
(8.99x10^15) in standard form
Hoochie [10]
8990000000000000 i think
5 0
3 years ago
6,000 mm= how many m<br> Pls help
AlexFokin [52]

Answer:

Step-by-step explanation:

1000 mm = 1 m

6000 mm = 6000/1000 = 6 m

8 0
3 years ago
A study was designed to investigate the effects of two​ variables, (1) A​ student's level of mathematical anxiety and​ (2) teach
Mashcka [7]

Answer:

P(X>400)=P(\frac{X-\mu}{\sigma}>\frac{400-\mu}{\sigma})=P(Z>\frac{400-440}{20})=P(z>-2)

And we can find this probability using the complement rule:

P(z>-2)=1-P(z

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(z>-2)=1-P(z

Step-by-step explanation:

Previous concepts

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 Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the scores of a population, and for this case we know the distribution for X is given by:

X \sim N(440,20)  

Where \mu=440 and \sigma=20

We are interested on this probability

P(X>440)

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X>400)=P(\frac{X-\mu}{\sigma}>\frac{400-\mu}{\sigma})=P(Z>\frac{400-440}{20})=P(z>-2)

And we can find this probability using the complement rule:

P(z>-2)=1-P(z

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(z>-2)=1-P(z

6 0
3 years ago
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