(Hint: this problem is about the sample size for estimating the proportion)

Q1: Assume that about 16% of people play video games, how many people must be surveyed in order to be 90% confident that the estimated percentage is within 5 percentage points of the true population percentage?

Q2: How many people must be surveyed in order to be 90% confident that the estimated percentage is within 5 percentage points of the true population percentage, if nothing is known about the worldwide percentage of people who play video games?