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Savatey [412]
3 years ago
14

The percent amounts of sand in 5 soil samples from the same garden are 73%, 68%, 88%, 74%, 81%. What is the average percent of s

and in this garden?
Mathematics
2 answers:
alina1380 [7]3 years ago
3 0
0.73+0.68+0.88+0.74+0.81=3.84

3.84 divided by 5
=0.768x100
=76.8% or 77%
nikitadnepr [17]3 years ago
3 0
Ok, so you add all of them together then divide by how many there are. So you do this .73+.68+.88+.74+.81=3.84 then since there are 5 percentages then you do 3.84/5 =.768 so round it to the nearest tenth and your answer is 77%
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I need help solving |5+2j|=9 please
V125BC [204]

5 + 2j = 9 \\ j = 2
5 + 2j =  - 9 \\ j =  - 7
3 0
3 years ago
<img src="https://tex.z-dn.net/?f=%5Ctext%7BSolve%20the%20system%20of%20equations%3A%7D%5C%5C%5C%5C%5Cleft%20%5C%7B%20%7B%7By%3D
Anika [276]

Hi there!  

»»————- ★ ————-««

I believe your answer is:  

(0.286, 5.587)

»»————- ★ ————-««  

Here’s why:  

⸻⸻⸻⸻

  • I have graphed the two equations in a program. When graphed, the lines intersect at point (0.286, 5.587).
  • See the graph attached.

⸻⸻⸻⸻

»»————- ★ ————-««  

Hope this helps you. I apologize if it’s incorrect.  

4 0
3 years ago
The fraction of defective integrated circuits produced in a photolithography process is being studied. A random sample of 300 ci
Olenka [21]

Answer:

The correct answer is

(0.0128, 0.0532)

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence interval 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

Z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}

For this problem, we have that:

In a random sample of 300 circuits, 10 are defective. This means that n = 300 and \pi = \frac{10}{300} = 0.033

Calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool.

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{300}} = 0.033 - 1.96\sqrt{\frac{0.033*0.967}{300}} = 0.0128

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{300}} = 0.033 + 1.96\sqrt{\frac{0.033*0.967}{300}} = 0.0532

The correct answer is

(0.0128, 0.0532)

4 0
3 years ago
Is this all correct?
expeople1 [14]
Yes it looks like it would be right
3 0
3 years ago
Read 2 more answers
Someone plz help with this!
Murljashka [212]

Answer:

15x-2+7x+4=90°[being complementary angle]

22x+2=90°

22x=90°-2

22x=88

x=88/22

x=4

8 0
2 years ago
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