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NNADVOKAT [17]
3 years ago
12

How can found thw length of arectngle

Mathematics
1 answer:
Minchanka [31]3 years ago
5 0
If you have the area of the rectangle, then the equation would be A = W*L

Lets say the area is 15 and the width is 3. You don't know what the length is. Just divide 3 into 15 to get 5. Hope this helps!
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A random sample of 20 purchases showed the amounts in the table (in $). The mean is $49.57 and the standard deviation is $20.28.
son4ous [18]

Answer:

The 98​% confidence interval for the mean purchases of all​ customers is ($37.40, $61.74).

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.98}{2} = 0.01

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.01 = 0.99, so z = 2.325

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 2.325*\frac{20.28}{\sqrt{20}} = 12.17

The lower end of the interval is the mean subtracted by M. So it is 49.57 - 12.17 = $37.40.

The upper end of the interval is the mean added to M. So it is 49.57 + 12.17 = $61.74.

The 98​% confidence interval for the mean purchases of all​ customers is ($37.40, $61.74).

3 0
3 years ago
Explain how making a table helps to compare two or more sets of data that have been presented in different ways.
yawa3891 [41]
Making a table helps compare two or more sets of data because you can look at how much it has increased or decreased.
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3 years ago
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[13 + (−19)] × (−7) ÷ (−3)
harina [27]

Answer:

-14

Step-by-step explanation:

c a l c u l a t o r

3 0
2 years ago
The distance to school and back is 5.28 miles. How far is it one way?
dusya [7]
I really believe the correct answer is 2.64 miles but if I am wrong I truly apologize
7 0
3 years ago
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Pls help me, im adding integers 40 points!!!!!!!!!
egoroff_w [7]

Answer:

1. 6

2. -1

3. 0

4. -9

5. 0

6. -21

7. 119

8. -60

9. 64

10. 45 degrees

Step-by-step explanation:

3 0
3 years ago
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