PLEASE HELP A Starbucks barista wants to construct a confidence interval for the proportion of customers who
prefer almond milk. What sample size should she use to estimate the proportion to within 4 percentage points at a 90% level of confidence?

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?