This is what I got buddy, hope I could possibly help in a way.
Answer: (23.25- 17.25) divided by 2
(Sorry I don’t have a division sign)
As the confidence level decreases, the width of the confidence interval increases.
If u look online im sure u would get the answer
87.5 per year put how ever many years since 1975 in as t...2016 would be 41 so 41 times 87.5 equals 3587.5