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3 years ago

Which is the scatter plot for the data set

Mathematics

1 answer:

11111nata11111 [884]3 years ago

5 0

Answer:

1970

Step-by-step explanation:

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What is the estimate quotient for 72 2/15 divided by 8 3/4?

saw5 [17]

It would be 175/1448 or 0.12085635......... hope this helped

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4 years ago

Student scores on exams given by a certain instructor have mean 74 and standard deviation 14. This instructor is about to give t

Lapatulllka [165]

Answer:

$P(\bar X >80)=P(Z>2.143)=1-P(z$

Step-by-step explanation:

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".

Let X the random variable that represent the Student scores on exams given by a certain instructor, we know that X have the following distribution:

$X \sim N(\mu=74, \sigma=14)$

The sampling distribution for the sample mean is given by:

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

The deduction is explained below we have this:

$E(\bar X)= E(\sum_{i=1}^{n}\frac{x_i}{n})= \sum_{i=1}^n \frac{E(x_i)}{n}= \frac{n\mu}{n}=\mu$

$Var(\bar X)=Var(\sum_{i=1}^{n}\frac{x_i}{n})= \frac{1}{n^2}\sum_{i=1}^n Var(x_i)$

Since the variance for each individual observation is $Var(x_i)=\sigma^2$ then:

$Var(\bar X)=\frac{n \sigma^2}{n^2}=\frac{\sigma}{n}$

And then for this special case:

$\bar X \sim N(74,\frac{14}{\sqrt{25}}=2.8)$

We are interested on this probability:

$P(\bar X >80)$

And we have already found the probability distribution for the sample mean on part a. So on this case we can use the z score formula given by:

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

Applying this we have the following result:

$P(\bar X >80)=P(Z>\frac{80-74}{\frac{14}{\sqrt{25}}})=P(Z>2.143)$

And using the normal standard distribution, Excel or a calculator we find this:

$P(Z>2.143)=1-P(z$

6 0

4 years ago

a father and son are digging a garden that is 7 feet wide. the father, working alone, can dig the garden in 3 hours. The son can

Anna71 [15]

There is a formula for this. (see attached)

Time = 3 * 4 / (3+4)
Time = 12 / 7
Time = <span> 1.714286 </span>
Time = <span> 1.7 (rounded)

</span>

3 0

3 years ago

Khloe invested $11,000 in an account paying an interest rate of 4.8% compounded continuously. Assuming no deposits or withdrawal

Firlakuza [10]

Answer:

i just did this problem its 24,880

Step-by-step explanation:

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3 years ago

Rewrite the equation in slope-intercept form. Then identify the slope and y-intercept.

ZanzabumX [31]

Answer:

Slope intercept form y= mx+b

y= 3/2x-5

slope= 3/2

y-int= -5

Step-by-step explanation:

4 0

3 years ago