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jeka57 [31]
3 years ago
11

.Divide the sum of 13/5 and -12/7 by the product of -31/7 and -(1/2)

Mathematics
2 answers:
andre [41]3 years ago
6 0

Answer:

hello u so cool i admire you <3

Karo-lina-s [1.5K]3 years ago
3 0
Solved! There you go :)

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Crash Hospital Costs. A study was conducts to estimate hospital costs for accident victims who wore seat belts. Twenty randomly
kvv77 [185]

Answer:

a) The 99% confidence interval would be given by (5004.168;12603.832)

b) For this case we can use the lower bound for the confidence interval as estimation, on this case 5004.168. But we need to take in count that this value it's with 99% of confidence and 1% of significance and 1% of probability to commit type Error I

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

\bar X =9004 represent the sample mean for the sample  

\mu population mean (variable of interest)

s=5629 represent the sample standard deviation

n=20 represent the sample size  

2) Part a

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=20-1=19

Since the Confidence is 0.99 or 99%, the value of \alpha=0.01 and \alpha/2 =0.005, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,19)".And we see that t_{\alpha/2}=2.86

Now we have everything in order to replace into formula (1):

9004-2.86\frac{5629}{\sqrt{20}}=5004.168    

9004+2.86\frac{5629}{\sqrt{20}}=12603.832

So on this case the 99% confidence interval would be given by (5004.168;12603.832)    

3) Part b

For this case we can use the lower bound for the confidence interval as estimation, on this case 5004.168. But we need to take in count that this value it's with 99% of confidence and 1% of significance and 1% of probability to commit type Error I

7 0
3 years ago
Find the quotient of 21x^2y^6+6xy^3-30xy/3xy.
kaheart [24]
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\bf \cfrac{21x^2y^6+6xy^3-30xy}{3xy}\implies \stackrel{\textit{distributing the denominator}}{\cfrac{21x^2y^6}{3xy}+\cfrac{6xy^3}{3xy}-\cfrac{30xy}{3xy}}&#10;\\\\\\&#10;\cfrac{21}{3}\cdot x^2x^{-1}y^6y^{-1}+\cfrac{6}{3}\cdot x^1x^{-1}y^3y^{-1}-\cfrac{30}{3}\cdot x^1x^{-1}y^1y^{-1}&#10;\\\\\\&#10;7x^{2-1}y^{6-1}+2x^{1-1}y^{3-1}-10x^{1-1}y^{1-1}\implies 7xy^5+2y^2-10
3 0
3 years ago
Read 2 more answers
select the correct answer hurry has 81 red balls what she wants to arrange in rows is the number of balls and which will not be
Arlecino [84]

Given

81 red balls

Number of balls per row = Number of rows

Procedure

b = Number of balls

r = Number of rows

T = Total number of balls

b = r

\begin{gathered} T=b\cdot r \\ Given\text{ b=r} \\ T=b^2 \\ b=\sqrt[]{T} \\ b=\sqrt[]{81} \\ b=9 \end{gathered}

The answer is:

Number of rows = 9

Number of balls = 9

7 0
1 year ago
What value is equal to the expression 7 – 4|-2|?
avanturin [10]

here's your answer !

  • 7 - 4 |-2|

  • 7 - (4 × 2)

  • 7 - 8

  • -1
3 0
2 years ago
I will give brainliest please help (ONLY IF YOU KNOW WHAT YOUR DOING)
vladimir2022 [97]

Step-by-step explanation:

The answer is 4.16

You can put it in calculator the answer is in decimal points because 25 does not comes in the table of 6

6 0
3 years ago
Read 2 more answers
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