Question 326468

a){{{Xave+- (1.645*sigma)/sqrt(N)=119155+(1.645*30000)/sqrt(80)}}}
.
.
b){{{Xave+- (1.96*sigma)/sqrt(N)=119155+(1.96*30000)/sqrt(80)}}}
.
.
c){{{Xave+- (2.576*sigma)/sqrt(N)=119155+(2.576*30000)/sqrt(80)}}}