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RoseWind [281]
3 years ago
15

5:20 and 15:60 equivalent

Mathematics
2 answers:
Sunny_sXe [5.5K]3 years ago
6 0

Answer:

Yes It is.

Step-by-step explanation:

5 x 3= 15

20x3 = 60

5:20 = 15:60

love history [14]3 years ago
6 0

it is 3:47 because you have to subtract from 12

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35. In a simple random sample of 25 high school students, the sample mean of the SAT scores was 1450, and the sample variance wa
Tatiana [17]

Answer:

1450-2.0\frac{30}{\sqrt{25}}=1450-12    

1450+2.0\frac{30}{\sqrt{25}}=1450+12    

And the best option would be:

c. 1450 +/- 12

Step-by-step explanation:

Information provided

\bar X=1450 represent the sample mean for the SAT scores

\mu population mean (variable of interest)

s^2 = 900 represent the sample variance given

n=25 represent the sample size  

Solution

The confidence interval for the true mean is given by :

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The sample deviation would be s=\sqrt{900}= 30

The degrees of freedom are given by:

df=n-1=2-25=24

The Confidence is 0.954 or 95.4%, the value of \alpha=0.046 and \alpha/2 =0.023, assuming that we can use the normal distribution in order to find the quantile the critical value would be z_{\alpha/2} \approx 2.0

The confidence interval would be

1450-2.0\frac{30}{\sqrt{25}}=1450-12    

1450+2.0\frac{30}{\sqrt{25}}=1450+12    

And the best option would be:

c. 1450 +/- 12

3 0
3 years ago
Can somebody help me with (a) and (b)? Thanks! :D
Pachacha [2.7K]

Answer:

PART A:

Line m: 1/2x + 6

Line n: 1/2x - 3

PART B:

The slope is the same in both lines

6 0
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Help me please help me help please
Dennis_Churaev [7]

Answer:

not sure

Step-by-step explanation:

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