Can someone help on these

Apolitical candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wanE a 196 margin of error at a 97.5% confidence level, what size of sample is needed? When finding the zvalue, round it to four decimal places. Hint: Video L?" [+] :J Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval for a sample of size 241 with 78% successes. Enter your answer as a tri-Linear inequality using decimals {not percents) accurate to three decimal places