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3 years ago

-3/x-3 +2/x-7 =1 please help

Mathematics

1 answer:

nydimaria [60]3 years ago

6 0

Answer:

Exact Form:

x = −1/11

Decimal Form:

x = −0.09

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Anni [7]

So 10% of 12=1.2 divided by

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$12.6 if you pay online

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4 years ago

Explain how to use a net to find the surface area of a prism

r-ruslan [8.4K]

Answer:

use a net to fin surface area of a prism by multyplying 10 to the power of 50

Step-by-step explanation:

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3 years ago

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4.56 natural numbers or a whole numbers integers rational numbers Irrational numbers or real numbers

pochemuha

Answer:

it is rational number

Step-by-step explanation:

Decimals are not natural and whole numbers.

irrational numbers cannot be expressed by fraction but this question can be experssed by decimal so it is rational number not irrational

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4 years ago

The distribution of the number of people in line at a grocery store has a mean of 3 and a variance of 9. A sample of the numbers

Airida [17]

Answer:

a) $P(\bar X >4)=P(Z>\frac{4-3}{\frac{3}{\sqrt{50}}}=2.357)$

$P(Z>2.357)=1-P(Z$

b) $P(\bar X \frac{2.5-3}{\frac{3}{\sqrt{50}}}=-1.179)$

$P(Z$

$P(2.5 < \bar X< 3.5) = P(\frac{2.5-3}{\frac{3}{\sqrt{50}}}$

$P(-1.179$ 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".

Part a

Let X the random variable that represent the number of people of a population, and for this case we know that:

Where $\mu=3$ and $\sigma=\sqrt{9}=3$

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

And we want to find this probability:

$P(\bar X >4)= P(z> \frac{4-3}{\frac{3}{\sqrt{50}}})$

And using a calculator, excel or the normal standard table we have that:

$P(Z>2.357)=1-P(Z$

Part b

$P(\bar X \frac{2.5-3}{\frac{3}{\sqrt{50}}})$

And using a calculator, excel or the normal standard table we have that:

$P(Z$

Part c

For this case we want this probability:

$P(2.5 < \bar X< 3.5) = P(\frac{2.5-3}{\frac{3}{\sqrt{50}}}$

And using a calculator, excel or the normal standard table we have that:

$P(-1.179$

7 0

3 years ago

You and your friend play the same note. Your friends instrument is in tune and is playing a note it 256 Hz, but your are slightl

Sati [7]

Answer:

In fact, they'll do that if only ONE of them is out of tune.

As long as there's a difference between the two frequencies,

they'll create beats.

Step-by-step explanation:

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4 years ago