Question 1186947
The difference of each endpoint from the mean is 0.032
0.032=z(sqrt(.77*.23)/1010); sqrt term=0.01324
z=-.032/0.01324=2.416
that is prob=0.0078 on each side, 0.0156 altogether, orange 98.44% CI.
This won't be exact because 77% will give 777.7 which can't be the numerator, it will have to be 778, and that will change the answer slightly.