On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally dist
ributed with σ = 100. The composition of bars has been slightly modified, but the modification is not believed to have affected either the normality or the value of σ. (a) Assuming this to be the case, if a sample of 25 modified bars resulted in a sample average yield point of 8439 lb, compute a 90% CI for the true average yield point of the modified bar. (b) Compute a 92% CI for the true average yield using the sample data in (a).
I believe the variable N would be 100,000 because it is saying that tickets are $50 a person so you have to multiply that by how many people are at the stadium. So you would do 50(100,000) which equals 5,000,000.