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skelet666 [1.2K]
2 years ago
6

A fruit stand has to decide what to charge for their produce. They need $10for 4 apples and 4 oranges. They also need $15 for 6

apples and 6 oranges. We put this information into a system of linear equations.
Mathematics
1 answer:
Nataly [62]2 years ago
4 0

Answer:

Ok

Step-by-step explanation:

Ok

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83 random samples were selected from a normally distributed population and were found to have a mean of 32.1 and a standard devi
arlik [135]

Answer:

\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}

4.525 \leq \sigma^2 \leq 7.602

Now we just take square root on both sides of the interval and we got:

2.127 \leq \sigma \leq 2.757

Step-by-step explanation:

Information given

\bar X=32.1 represent the sample mean

\mu population mean (variable of interest)

s=2.4 represent the sample standard deviation

n=83 represent the sample size  

Confidence interval

The confidence interval for the population variance is given by the following formula:

\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}

The degrees of freedom given by:

df=n-1=8-1=7

The confidence level is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical values.  

The excel commands would be: "=CHISQ.INV(0.05,82)" "=CHISQ.INV(0.95,82)". so for this case the critical values are:

\chi^2_{\alpha/2}=104.139

\chi^2_{1- \alpha/2}=62.132

The confidence interval is given by:

\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}

4.525 \leq \sigma^2 \leq 7.602

Now we just take square root on both sides of the interval and we got:

2.127 \leq \sigma \leq 2.757

5 0
3 years ago
Are 2.7, 3.6, and 4.5 a pythagorean triple
grigory [225]
They are because 2.7 squared + 3.6 squared = 4.5 squared (=20.25) 

Pythagoras Theorem is that a squared + b squared = c squared 

So the 2 smallest numbers squared will equal the larger one squared if it is a pythagoreom triple
7 0
3 years ago
What’s 28 dived by 6691 showing step by step
bekas [8.4K]

Answer:

28/6691= 0.004185

3 0
3 years ago
if you actually know plz give an explanation to the answer so i know you aren't just answering for points, please help this is d
SashulF [63]

Answer:

A.

Step-by-step explanation:

it is the only one that makes sense, because it deals with 8th graders, all others include gender which i do not think that matters.

3 0
3 years ago
Find the area of the circle. Round your answer to the nearest tenth. Use 3.14 or 22 for it mm area: about mm​
FromTheMoon [43]

Answer:

254.34mm

Step-by-step explanation:

3.14 * 9^2 = 3.14*81 = 254.34mm

6 0
2 years ago
Read 2 more answers
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