Answer:
20.27
Step-by-step explanation:
The Central Limit Theorem estabilishes that, for a random variable X, with mean
and standard deviation
, the sample means with size n of at least 30 can be approximated to a normal distribution with mean
and standard deviation ![s = \frac{\sigma}{\sqrt{n}}](https://tex.z-dn.net/?f=s%20%3D%20%5Cfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D)
Using the Central Limit Theorem for Means, what is the standard deviation for the sample mean distribution?
This is s when
. So
![s = \frac{136}{\sqrt{45}} = 20.27](https://tex.z-dn.net/?f=s%20%3D%20%5Cfrac%7B136%7D%7B%5Csqrt%7B45%7D%7D%20%3D%2020.27)
So the correct answer is:
20.27
45.00x +17.99 = 422.99 (Setup Equation)
45.00x = 405 (Subtract 17.99 from both sides)
x = 9 (Divide both sides by 45.00)
Vertex = (1,-4)
Focus = (1, -1)
Directix =
y= -7
Hope this helped
Answer:
B. 3x -7y < -21
Step-by-step explanation:
For this problem, a quick way to the correct answer choice is to determine on which side of the y-intercept the equation tells you the solution lies. That is ...
- set x=0
- divide by the coefficient of y
Doing this transforms the answer choices to ...
A: y < 3
B: y > 3
C: y > -3
D: y < -3
The graph clearly shows the solution space on the y-axis is in the region y > 3, matching choice B.