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nexus9112 [7]
2 years ago
6

6. Find the equation of a parabola with a focus of (0, 15) and directrix y = -15

Mathematics
1 answer:
mihalych1998 [28]2 years ago
8 0
Hey i just need points
U got this
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A class has an equal number of boys and girls. The boys all got 78% on a test and the girls all got 84%. What are the mean and s
Sergio039 [100]

Answer:

Mean is 81%

standard deviation is approximately 4.2%

Step-by-step explanation:

Since the number of boys equals the number of girls, but it is not given, we name it "N". and proceed to calculate the mean as:

Mean = (0.78 * N + 0.84 * N) /(2 N)

using that the total number of students must be N boys + N girls = 2 N

Then the Mean becomes: N *(0.78 + 0.84) /(2 N) = (0.78 + 0.84) / 2 = 1.62 / 2 = 0.81

So the mean is 81%

Now, standard deviation will be calculated by first adding the squares of the deviations: (X-0.81)^2 for the N boys and for the N girls, and then finding the square root of this and finally dividing by the square root of N. That is:

N\,(0.78-0.81)^2\,+\,N\,(0.84-0.81)^2= N \left \{ (-0.03)^2+(0/03)^2\right \}=N\,*0.0018

Now finding the square root of this value, and finally dividing it by the square root of N:

\sigma=\frac{\sqrt{N\,*\,0.0018} }{\sqrt{N} } =\sqrt{0.0018} \approx 0.042426

which in percent form is: approximately 4.2%

7 0
3 years ago
How do I write 684297 in word form?
Daniel [21]

Answer:

Six hundred eighty-four thousand two hundred ninety-seventh

6 0
3 years ago
Please HELP ME!!! Write an equation and solve it the answer choices are down below thank you!!!
sesenic [268]
I do not understand why you or your teacher have written down a certain number of minutes by each equation, but I will do my best to answer your question. I hope that I’m able to help.

1,2) 20 + 3.5x = 30 + 2.75x
-20 -20
3.5x = 30 + 2.75x - 20
-2.75x -2.75x
0.75x = 10
/0.75 /0.75
x = 13.333...

3,4) 3.5x + 2.75x = 20 + 30
6.25x = 50
/6.25. /6.25
x = 8


4 0
2 years ago
Question 7 (1 point)
My name is Ann [436]

Answer:

answer for 8 is 1500

Step-by-step explanation:

6 0
3 years ago
Eight friends share 4 bunches of grapes equally. What fraction of a bunch of grapes does each friend get?
vekshin1
You just divide 4 by 8, which equals 1/2
8 0
3 years ago
Read 2 more answers
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