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lana66690 [7]
3 years ago
7

How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 95% confidence that

the sample mean is within 5 minutes of the population mean, and the population standard deviation is known to be 7 minutes.
Mathematics
1 answer:
lukranit [14]3 years ago
5 0

Answer: 25 computers will be selected

Step-by-step explanation:

Where: Z -value at 95% confidence = 1.96; SD = Standard deviation = 10 minutes; N = Sample size; Margin error = 4 minutesSubstituting;4 = 1.96*10/Sqrt (N)Sqrt (N) = (1.96*10)/4 = 4.9N = 4.9^2 = 24.01 ≈ 25

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Would it be 4? Or would I do 1 divided by four
Lunna [17]

Answer:

k = 4

Step-by-step explanation:

The graph represents y and x in direct proportion with equation

y = kx ← k is the constant of proportionality

To find k use the point (1, 4), that is x = 1, y = 4

k = \frac{y}{x} = \frac{4}{1} = 4

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3 years ago
What is this because I don’t know how to find the angle of V if it’s like this
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Answer:

Step-by-step explanation:

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Which of the following is the equation of a circle with a radius of 10 cm and center at (–3, 6)?
Volgvan

The equation of the circle:

(x-h)^2+(y-k)^2=r^2

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r - radius

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r=10\\(-3,\ 6)\to h=-3,\ k=6

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4 0
3 years ago
Helpp picture above I will mark
ivolga24 [154]

Answer:

I believe the answer is 45

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5 0
3 years ago
Read 2 more answers
Solve the system of linear equations by ellmination. 5x + 9y = -11 3x + 9y = -3 A. (-4,-1) -B. (-1, –4) C. (-4,1) D. (1,-4)​
valentina_108 [34]

Answer:

Step-by-step explanation:

5x + 9y = -11

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x = -4

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9y = 9

y = 1

(-4, 1)

Answer is C

5 0
3 years ago
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