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nordsb [41]
3 years ago
11

Help quickly please!

Mathematics
1 answer:
Zarrin [17]3 years ago
6 0
The answer to your question is C
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Tensile strength tests were performed on two different grades of aluminum spars used in manufacturing the wing of a commercial t
jekas [21]

Answer:

(12.1409, 14.0591

Step-by-step explanation:

Given that Tensile strength tests were performed on two different grades of aluminum spars used in manufacturing the wing of a commercial transport aircraft. From past experience with the spar manufacturing process and the testing procedure, the standard deviations of tensile strengths are assumed to be known.

Group   Group One     Group Two  

Mean 87.600 74.500

SD 1.000 1.500

SEM 0.316 0.433

N 10      12    

The mean of Group One minus Group Two equals 13.100

standard error of difference = 0.556

 90% confidence interval of this difference:  

(13.1-1.725*0.556,13.1+1.725*0.556)\\=(12.1409, 14.0591)

  t = 23.5520

 df = 20

4 0
3 years ago
Jack is learning to play the piano. Which has 88 keys. If there are 12 unique keys in each octave. How many complete octavs are
Anit [1.1K]
To find the amount of complete octaves there are on the piano, you must first divide 88/ 12; which is 7.333. Since the question is asking for the amount of complete octaves, you must round down to 7. Your final answer is 7 complete octaves.
3 0
3 years ago
The exterior angle of a triangle is 119° and its interior opposite angle are in the ratio 8:9. Find the angle of a triangle
erastovalidia [21]

Answer:

see explanation

Step-by-step explanation:

the ratio of the opposite interior angles = 8 : 9 = 8x : 9x

The exterior angle of a triangle = sum of the opposite interior angles, hence

8x + 9x = 119

17x = 119 ( divide both sides by 17 )

x = 7

8 parts = 8x = 8 × 7 = 56

9 parts = 9x = 9 × 7 = 63

The sum of the 3 angles in a triangle = 180°

subtract the sum of the 2 angles from 180 for third angle in triangle

180° - (56 + 63)° = 180° - 119° = 61°

The 3 angles of the triangle are 56°, 61°, 63°


8 0
3 years ago
What is the measure of Zx?<br> X= ??
Montano1993 [528]

Answer:

x = 31 degrees

Step-by-step explanation:

180 - 149 = 31

Hope this helps!

3 0
3 years ago
How can i use similarity and proportionality to find missing measures
lilavasa [31]
You can compare the angles or other measurements to find the one you are looking for.
6 0
4 years ago
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