Presidential job approval is the most-watched statistic in American politics. According to the June 2010 NBC/ Wall Street Journal public opinion poll, president Barack Obama had reached his lowest approval rating since taking office in January of 2009. The poll showed that 48% of people disapproved of the job Obama was doing as president of the United States, while only 45% approved. Experts attributed the drop in approval ratings to a poor economy and the government's reaction to the massive oil spill in the Gulf of Mexico. Use the June 2010 approval and disapproval ratings to answer the following questions.
a. What is the probability that President Obama gets a majority support in a random sample of 50 Americans?
b. What is the probability that President Obama gets a majority disapproval in a random sample of 50 Americans?