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3 years ago

PLEASE HELP WILL GIVE BRAINLIEST!!!!! A survey asked students whether they have any siblings and pets.

Mathematics

2 answers:

LiRa [457]3 years ago

7 0

The answrr is B, 60%. 45/75 equals 60, so it should be 60%.

siniylev [52]3 years ago

3 0

Answer:

Option B.

Step-by-step explanation:

The given table represents the relative frequency.

Let A and B represent the following events.

A : Student does not have a sibling

B : Students has a pet.

Then intersection of A and B (A∩B) denotes the event that the student does not have a sibling but has a pet.

Using the given table it is clear that

P(A∩B) = 0.15

We need to find the probability that the student does not have a pet given that student has a sibling. It means we need to find the value of P(B|A).

Formula for conditional probability:

$P(B|A)=\dfrac{P(A\cap B)}{P(A)}$

Substitute the given values.

$P(B|A)=\dfrac{0.15}{0.25}$

$P(B|A)=\dfrac{3}{5}$

$P(B|A)=0.6=60\%$

The probability that the student does not have a pet given that student has a sibling is 60%.

Therefore, the correct option is B.

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The slope of a line is the ratio of rise to run for any two points on a line. Is this a true statement? Explain in two to four s

Blizzard [7]

Answer:

True

Step-by-step explanation:

The slope is the ratio of rise to run for any two points on a line.

The rise is the change in vertical axis, y

Rise = y2 - y1

The run is the change in the horizontal axis, x

Run = x2 - x1

Slope is the ratio of both:

Rise / Run = (y2 - y1) / (x2 - x1)

8 0

3 years ago

Anybody good in geometry and know how to do this? Free Brainliest and points !! I need at least 3 ppl to answer this !

yan [13]

Answer:

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Step-by-step explanation:

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3 years ago

33 1/3% of 360 please help I don’t understand

Mars2501 [29]

Answer:

33 1/3% of 360 is 120

Step-by-step explanation:

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3 0

3 years ago

Read 2 more answers

In a recent year, Washington State public school students taking a mathematics assessment test had a mean score of 276.1 and a s

Oksi-84 [34.3K]

Answer:

a) $\mu_{\bar x} =\mu = 276.1$

$\sigma_{\bar x} =\frac{\sigma}{\sqrt{n}}=\frac{34.4}{\sqrt{64}}=4.3$

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

$\bar X \sim N(\mu=276.1, \frac{\sigma}{\sqrt{n}}=4.3)$

c) $P(\bar X \geq 285)=P(Z\geq \frac{285-276.1}{4.3}=2.070)$

$P(Z\geq2.070)=1-P(Z$

Step-by-step explanation:

Let X the random variable the represent the scores for the test analyzed. We know that:

$\mu=E(X) = 276.1 , \sigma=Sd(X) = 34.4$

And we select a sample size of 64.

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".

Part a

For this case the mean and standard error for the sample mean would be given by:

$\mu_{\bar x} =\mu = 276.1$

$\sigma_{\bar x} =\frac{\sigma}{\sqrt{n}}=\frac{34.4}{\sqrt{64}}=4.3$

Part b

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

$\bar X \sim N(\mu=276.1, \frac{\sigma}{\sqrt{n}}=4.3)$

Part c

For this case we want this probability:

$P(\bar X \geq 285)$

And we can use the z score defined as:

$z=\frac{\bar x -\mu}{\sigma_{\bar x}}$

And using this we got:

$P(\bar X \geq 285)=P(Z\geq \frac{285-276.1}{4.3}=2.070)$

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

$P(Z\geq2.070)=1-P(Z$

8 0

3 years ago

Complete the steps to find the value of x.<br> 2x<br> 1289<br> 22<br> 2

Oksanka [162]

Answer:

Step-by-step explanation:

2x = 128

x = 128/2

x = 64

6 0

3 years ago