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tatuchka [14]
3 years ago
11

The mean of birth weights for individual babies in the population is 3,500 grams. What is the mean birth weight for the sampling

distribution for samples of 100 babies?
Mathematics
1 answer:
Gala2k [10]3 years ago
8 0

Answer:

The mean birth weight for the sampling distribution is

3,500 grams.

Step-by-step explanation:

The sample mean is the average of the sample values collected divided by the number of the samples, while the population mean is the average or mean of all the values in the population.  If the sample is random and the sample size is large enough, then the sample mean would be a good estimator of the population mean.  This implies that with a randomly distributed and unbiased sample size, the sample mean and population mean will be equal, according to the central limit theorem. Therefore, the mean of the sample means will always approximate the population mean.

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Find the standard form of the equation of the parabola with a vertex at the origin and a focus at (0, -7).
creativ13 [48]
So hmm check the picture below

we know the vertex is at the origin, and the focus point is below it, that means two things, the parabola is vertical and it's opening downwards

notice the distance "p", from the vertex to the focus point, is just 7 units, however, since the parabola is opening downwards, the "p" value will be negative, so p = -7

\bf \textit{parabola vertex form with focus point distance}\\\\
\begin{array}{llll}
(y-{{ k}})^2=4{{ p}}(x-{{ h}}) \\\\
\boxed{4{{ p}}(y-{{ k}})=(x-{{ h}})^2 }\\
\end{array}
\qquad 
\begin{array}{llll}
vertex\ ({{ h}},{{ k}})\\\\
{{ p}}=\textit{distance from vertex to }\\
\qquad \textit{ focus or directrix}
\end{array}\\\\
-------------------------------\\\\
4{{ p}}(y-{{ k}})=(x-{{ h}})^2\quad 
\begin{cases}
h=0\\
k=0\\
p=-7
\end{cases}\implies 4(-7)(y-0)=(x-0)^2
\\\\\\
-28y=x^2\implies y=-\cfrac{1}{28}x^2

8 0
2 years ago
Lily is in the business of manufacturing phones. She must pay a daily fixed cost to rent the building and equipment, and also pa
Nesterboy [21]

Answer:

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Step-by-step explanation:

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the equation of a line is given as

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In the context of this problem m=100 means that the cost of producing a phone per material and labour cost is $100

7 0
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Answer:

(2b, 2b + 7)

Step-by-step explanation:

y=f(x) = x +7

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(2b, 2b + 7)

6 0
3 years ago
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Answer:

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Step-by-step explanation:

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