1. https://www.chegg.com/homework-help/questions-and-answers/let-population-normally-distributed-mean-standard-deviation-5-find-sample-size-n-95-percen-q9157129

2. https://www.chegg.com/homework-help/questions-and-answers/2-let-u-mileage-certain-brand-tire-sample-n-20-tires-taken-random-resulting-sample-mean-x--q41854501

3a. https://www.chegg.com/homework-help/Probability-and-Statistics-for-Engineering-and-the-Sciences-8th-edition-chapter-7-problem-10E-solution-9780538733526

3b. https://www.chegg.com/homework-help/Probability-and-Statistics-for-Engineering-and-the-Sciences-8th-edition-chapter-7-problem-12E-solution-9780538733526

3c. https://www.chegg.com/homework-help/Probability-and-Statistics-for-Engineering-and-the-Sciences-8th-edition-chapter-7-problem-22E-solution-9780538733526