I'm pretty sure you did it right.
B is 5, you can solve this by first finding the value of a, which is 2, and then plug it into the other equation. 8+2=10 so we must also make the other side 10. We then do 10-5=5, 5 is the value of b
Answer:
The confidence interval is (0.444 ± 0.111).
Step-by-step explanation:
The general form of a confidence interval for single proportion is: 
The interval provided is: (0.333 < p < 0.555)
Then

Solving the two equation simultaneously:
Add (i) and (ii),

Substitute the value of
in (i) to compute the value of <em>E:</em>

Thus, the confidence interval is,

Answer:
Around 43-44% is left.
Step-by-step explanation:
43% of 575.00 is 252 which is 575 - 322.
Let me know if there are problems or if i'm wrong.