7) 780 people out of a sample of 6240 people believe that pineapple is a must have ingredient on pizza. (I made up those numbers. They aren't from a real poll.) Find a 90% confidence interval for the proportion of people who believe pineapple is a must have ingredient. (7 points) 8) A sample of size 35 is drawn. The sample average is x - 18.4. The sample standard deviation s # 4.5. Find a 95% confidence interval for the mean u. (7 points)