120/4 = 30
120 x 2 = 240
240 + 30 = 270
270 grams of flour were used
Answer:
z=30
Step-by-step explanation:
Answer:
y=-3
Step-by-step explanation:
slope is 0 so we know it is a straight line.
your y value is -3 so therefor is your answer
Complete Question
A biologist reports a confidence interval of (3.5,4.9) when estimating the mean height (in centimeters) of a sample of seedlings. What is the estimated margin of error and the sample mean?
Answer:
The margin of error is ![E = 0.7](https://tex.z-dn.net/?f=E%20%3D%200.7)
The sample mean is ![\= x = 4.2](https://tex.z-dn.net/?f=%5C%3D%20%20x%20%20%3D%20%204.2)
Step-by-step explanation:
from the question we are told that
The upper limit is ![k = 4.9](https://tex.z-dn.net/?f=k%20%20%3D%20%204.9)
The lower limit is ![r = 3.5](https://tex.z-dn.net/?f=r%20%3D%203.5)
Generally the margin of error is mathematically represented as
![E = \frac{k - r}{ 2}](https://tex.z-dn.net/?f=E%20%3D%20%20%5Cfrac%7Bk%20-%20r%7D%7B%202%7D)
![E = \frac{ 4.9 - 3.5 }{2}](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7B%204.9%20%20-%20%203.5%20%7D%7B2%7D)
![E = 0.7](https://tex.z-dn.net/?f=E%20%3D%200.7)
Generally the sample mean is mathematically evaluated as
![\= x = k - E](https://tex.z-dn.net/?f=%5C%3D%20%20x%20%3D%20k%20%20-%20%20E)
=> ![\= x = 4.9 - 0.7](https://tex.z-dn.net/?f=%5C%3D%20x%20%20%3D%20%204.9%20-%200.7)
=> ![\= x = 4.2](https://tex.z-dn.net/?f=%5C%3D%20%20x%20%20%3D%20%204.2)
The temperature would be -7 degrees