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Dmitry_Shevchenko [17]
3 years ago
7

A study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet Cavalier shows that the mean

is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time exceeds 8.7 hours.
Group of answer choices

A. 0.1946
B. 0.1285
C. 0.1469
D. 0.1346
Mathematics
1 answer:
Sliva [168]3 years ago
6 0

Answer:

b. 01285 esa es, espero este buena y que te ayude

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Please help. Wrong answer will be reported
marissa [1.9K]

top:

(2x - 3y)^2

= 4x^2 - 12xy + 9y^2

bottom:

(3y - 2x)^2

= 9y^2 - 12xy + 4x^2

= 4x^2 - 12xy + 9y^2 (same as top)

so

(4x^2 - 12xy + 9y^2) / ( 4x^2 - 12xy + 9y^2) = 1

Ava is not correct. If you look at the denominator on her work:

[-(2x – 3y)]^2

= [(-1 )(2x – 3y)]^2

= (-1)^2 (2x – 3y)^2

= (2x – 3y)^2

so (2x – 3y)^2 / (2x – 3y)^2 = 1

The correct answer is 1

3 0
3 years ago
What's a non iscoceles trapezoid
nadezda [96]
It'd be a trapezoid that either has 4 different unique line lengths, or 3 or more sides are the same length.
6 0
3 years ago
What is the image of N for a 300 degree counterclockwise rotation about the center of the regular hexagon?
Afina-wow [57]

Answer:

B) H  

Step-by-step explanation:

Notice that a regular hexagon has a <em>six-fold rotational symmetr</em>y.

Every time you rotate it about its centre by one-sixth of a circle (60°), you map a vertex onto the one next to it.

If you rotate the hexagon 300° counterclockwise, that is equivalent to rotating it 60° clockwise.

When you rotate the hexagon 60° clockwise (one-sixth of a circle),

Point N maps onto point H.

3 0
3 years ago
Read 2 more answers
Given below is the odd-number function. Which of the following are equal to O(9)? Check all that apply.
Romashka [77]
The correct answers will be A. The ninth odd number. B.O(8) + 2 and D.17.

I did this too and those were the right answers!

I hope this helps! :>
3 0
3 years ago
5) Rolanda scored 20, 15and 16 on hefirst three mathquizzes. Jetta scored 16, 19and17 on her quizzes Usingthe mean to compare, w
Wittaler [7]
To find mean/average it's fairly simple!! :)

The first thing you should do is add up the first numbers -
* 20 + 15 + 16 = 51 :)
* 16 + 19 + 17 = 52

Now divide each of the scores by the amount of numbers there is -
* 20 (1) 15 (2) 16 (3)
* 16 (1) 19 (2) 17 (3)

51 ÷ 3 = 17 (Rolanda's Average Score)
- Which # is bigger?
52 ÷ 3 = 17.3 (Jetta's Average Score)
8 0
3 years ago
Read 2 more answers
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