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yanalaym [24]
3 years ago
5

Looking for more friends(whats 2+2) plz dont report

Mathematics
2 answers:
JulsSmile [24]3 years ago
6 0

Answer:

4

Step-by-step explanation:

thz for the point :)))))))))))

Svetllana [295]3 years ago
4 0

Answer:

4

Step-by-step explanation:

+=

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A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and test
frutty [35]

Answer:

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

Step-by-step explanation:

We are in posession of the sample's standard deviation, so we use the students t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 16 - 1 = 15

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.68

The margin of error is:

M = T*s = 2.1315*3645.94 = 7771.3

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 60139.7 - 7771.3 = 52,368.4.

The upper end of the interval is the sample mean added to M. So it is 60139.7 + 7771.3 = 67,911.

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

3 0
3 years ago
Read 2 more answers
The foot of an extension ladder is 10 ft from a wall. the ladder is 2 ft longer than the height that it reaches on the wall. how
Mrac [35]
This makes a right triangle with hypotenuse x+2 and legs 10 and x

10²+x²=(x+2)²

100 + x² = x²+4x+4

100=4x+4

4x=96

x=24, the height we are looking for
4 0
3 years ago
Read 2 more answers
(3n + 8n^ + 8n2) – (8n4 – 4n2 – 7)
Amanda [17]

Answer:

- 8n^{4}  + 12n^{2}  + 11n + 7

6 0
3 years ago
I need this answer asap
densk [106]

Answer:

16 x 6 divided by 2 is 48

First add the two bases together whenever you're trying to find the area of a trapezoid then multiply it by the height and multiply by it by 1/2 (which basically you divide by 2).

7 0
2 years ago
Should any factors be accounted for when<br> explaining how to solve an equation?
Veronika [31]
Yes, it should be taken into account
3 0
3 years ago
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