1. 4.47 x 10^3
2. 4.8 x 10^8
B is the answer.
Hope it helps!
Answer:
D, C, E, A, B
Step-by-step explanation:
This is essentially the construction of a perpendicular bisector.
1. Jamestown
2. Plymouth and Boston
3. Savannah
4. Charleston
5. Providence
6. Philadelphia
7. St. Mary's
8. Hartford
9. New Amsterdam
Answer: 0.7881446
Step-by-step explanation:
Given : Mean : ![\mu = 267\text{ dollars}](https://tex.z-dn.net/?f=%5Cmu%20%3D%20267%5Ctext%7B%20dollars%7D%20)
Standard deviation : ![\sigma =20 \text{ dollars}](https://tex.z-dn.net/?f=%5Csigma%20%3D20%20%5Ctext%7B%20dollars%7D)
Sample size : ![n=64](https://tex.z-dn.net/?f=n%3D64)
The formula to calculate the z-score :-
![z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7Bx-%5Cmu%7D%7B%5Cdfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D%7D)
For x= 267 dollars
![z=\dfrac{267-267}{\dfrac{20}{\sqrt{64}}}=0](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7B267-267%7D%7B%5Cdfrac%7B20%7D%7B%5Csqrt%7B64%7D%7D%7D%3D0)
For x= 269 dollars.
![z=\dfrac{269-267}{\dfrac{20}{\sqrt{64}}}=0.80](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7B269-267%7D%7B%5Cdfrac%7B20%7D%7B%5Csqrt%7B64%7D%7D%7D%3D0.80)
The P-value : ![P(0](https://tex.z-dn.net/?f=P%280%3Cz%3C0.8%29%3DP%28z%3C0.8%29-P%28z%3C0%29)
![= 0.7881446-0.5= 0.2881446\approx 0.7881446](https://tex.z-dn.net/?f=%3D%200.7881446-0.5%3D%200.2881446%5Capprox%200.7881446)
Hence, the probability that they have a mean cost between 267 dollars and 269 dollars.= 0.7881446