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3 years ago

PLEASE ANSWER ILL GIVE YOU BRAINLIEST

Mathematics

2 answers:

EleoNora [17]3 years ago

6 0

Answer:

i think its 28.27

Step-by-step explanation:

Harman [31]3 years ago

6 0

Step-by-step explanation:

$v \: = \: pi \: \times \: r {}^{2} \: \times h$

Volume = 3.14×2.25×4 = 28.26 yd³

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What's the solution of x+2/5= 12 ?

Feliz [49]

Answer:

11 3/5

Step-by-step explanation:

x+2/5=12

First, you subtract 2/5 from both sides, so the equation becomes:

x=11 3/5

Therefore, x equals 11 3/5

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4 years ago

∣∣x+34∣∣=−11, How do you solve this

VMariaS [17]

Answer:

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Step-by-step explanation:

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3 years ago

A simple random sample of size nequals=8181 is obtained from a population with mu equals 77μ=77 and sigma equals 27σ=27. (a) De

ivanzaharov [21]

Answer:

a) $P(\bar X>81.5)=1-0.933=0.067$

b) $P(\bar X$

c) $P(73.4$

Step-by-step explanation:

1) 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".

Let X the random variable that represent interest on this case, and for this case we know the distribution for X is given by:

$X \sim N(\mu=77,\sigma=27)$

And let $\bar X$ represent the sample mean, the distribution for the sample mean is given by:

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

On this case $\bar X \sim N(77,\frac{27}{\sqrt{81}})$

Part a

We want this probability:

$P(\bar X>81.5)=1-P(\bar X$

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

$z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}$

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

$P(\bar X >81.5)=1-P(Z$

$P(\bar X>81.5)=1-0.933=0.067$

Part b

We want this probability:

$P(\bar X\leq 69.5)$

If we apply the formula for the z score to our probability we got this:

$P(\bar X \leq 69.5)=P(Z\leq \frac{69.5-77}{\frac{27}{\sqrt{81}}})=P(Z$

$P(\bar X\leq 69.5)=0.0062$

Part c

We are interested on this probability

$P(73.4$

If we apply the Z score formula to our probability we got this:

$P(73.4$

$=P(\frac{73.4-77}{\frac{27}{\sqrt{81}}}$

And we can find this probability on this way:

$P(-1.2$

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

$P(-1.2$

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4 years ago

Classify the function as linear or quadratic and identify the quadratic, linear, and constant terms.

kogti [31]

Answer: Quadratic; 6x^2, x, -12

Detailed Explanation:

The highest power of the function (degree) is 2. Therefore it is a quadratic function. The quadratic term is 6x^2 since its power is 2, the linear term is x since its power is 1 and the constant term is -12.

5 0

3 years ago