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Aleks04 [339]
3 years ago
8

Two different formulations of an oxygenated motor fuel are being tested to study their road octanenumbers. The variance of road

octane number for formulation 1 is ı2 = 1.5, and for formulation, 2it is ı2 = 1.2. Two random samples of size n1 = 15 and n2 = 20 are tested, and the mean roadoctane numbers observed are x1 = 89.6 and x2 = 92 5. Assume normality. Find the 95%confidence interval for the difference in the mean octane number.
Mathematics
1 answer:
Lyrx [107]3 years ago
3 0

Answer:chomai

Step-by-step explanation:chomai

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3. Mrs Green bakes muffins.
Sphinxa [80]

Answer:

85%

Step-by-step explanation:

Monday:

200 x 0.70 = 140

200 - 140 = 60

Tuesday:

400 x ? = 60

400 x 0.85 = 340

400 - 340 = 60

8 0
3 years ago
Bryant collected 2 pounds of newspaper for the recycling drive. Luther collected 3 7/8 times as much newspaper as Bryant. How ma
True [87]

Answer:

Luther collected 7.75 pounds of newspaper

Step-by-step explanation:

2 times 3.875

7.75

6 0
3 years ago
HELP!! Triangle A′B′C′ is the image of triangle ABC after a dilation.
Nina [5.8K]
Down three and over left four so something like (-3, -4) im pretty sure
3 0
3 years ago
Find a unit vector that has the same direction as the vector a and the opposite direction of the vector
nasty-shy [4]
The unit vector is given by the following formula:
 a '= (a) / (lal)
 Where,
 a: vector a
 lal: Vector module a
 We are looking for the module:
 lal = root ((- 15) ^ 2 + (8) ^ 2)
 lal = 17
 Same direction:
 a = -15i + 8j
 The unit vector is:
 a '= (1/17) * (- 15i + 8j)
 Opposite direction:
 a = 15i - 8j
 The unit vector is:
 a '= (1/17) * (15i - 8j)
 Answer:
 
a unit vector that has the same direction as the vector a is:
 
a '= (1/17) * (- 15i + 8j)
 
a unit vector that has the opposite direction of the vector a is:
 
a '= (1/17) * (15i - 8j)
5 0
3 years ago
In the figure,  x ∥ y and a is a transversal that crosses the parallel lines.
Dominik [7]
Here, exterior angles are 1, 2, 7 & 8 as they are outside the parallel lines, & among them, alternates are: 1 with 7 and 2 & 8. 1 & 7 is not in option but 2 and 8 is there in C

In short, Your Answer would be Option C

Hope this helps!
8 0
3 years ago
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