A poll conducted by Zogby International showed that of those Americans who said music plays a "very important" role in their lives, 30% said their local radio stations "always" play the kind of music they like (Zogby website, January 12, 2004). Suppose a sample of 800 people who say music plays an important role in their lives is taken.
a. How many would you expect to say that their local radio stations always play the kind of music they like?
b. What is the standard deviation of the number of respondents who think their local radio stations always play the kind of music they like?
c. What is the standard deviation of the number of respondents who do not think their local radio stations always play the kind of music they like?