Answer:
b
Step-by-step explanation:
We must determine the the x value at 90% confidence interval. We find this from a table relating confidence intervals and x values. For 90%, z is 1.645.
WE must determine the mean of 19 and 23:
![=(19+23)/2=21](https://tex.z-dn.net/?f=%3D%2819%2B23%29%2F2%3D21)
We must determine the standard deviation. We let n be the number of population which is 2. We need to take the numbers 19 and 23 and subtract each by the mean and square the answer:
![(19-2)^2=289](https://tex.z-dn.net/?f=%2819-2%29%5E2%3D289)
![(23-2)^2=441](https://tex.z-dn.net/?f=%2823-2%29%5E2%3D441)
We then determine the mean of these two values as:
![(289+441)/2=365](https://tex.z-dn.net/?f=%28289%2B441%29%2F2%3D365)
Now we take the square root of 365:
![\sqrt{365}=19.1](https://tex.z-dn.net/?f=%5Csqrt%7B365%7D%3D19.1)
The standard deviation is 19.1
The answer is b
Answer:
The scale is five. you do 90 divided by 18.
So the pencils all together would be $6 so divide that by 3 and you get D as your answer each pencil costs $2
The answer is the third one because the answer to 4-4 is 0.
Answer:
1. Shift down
2. Shift Up
3. More Steep
4. Less Steep
Step-by-step explanation:
Hope I helped