(a) What is the mean age for those respondents who said that they are White, live in the North East, and are very happy?

(b) What is the mean of those who said that they belong to the Other category, live in the West, and are very happy?

(c) What is the mean of those who said that they live in the South East, are Black, and are not too happy?

(d) What is the mean of those who are White, live in the South East, and are pretty happy?

(e) Which of the three regions has the lowest mean age of people who are not too happy?

(f) Within the North East region, which race has the highest percentage of very happy people?