Answer:
79%
Step-by-step explanation:
First of all, the point estimate is a value located in between the upper confidence limit and the lower confidence limit, it identifies a point in some parameter space.
This question provides us with an interval estimate which is a range of values used to estimate a population parameter.
Interval Estimate = 75% to 83%
75% = Lower confidence limit
83% = Upper confidence limit
Point estimate = middle value
= 
= 79%