Question: Birth order. Is your birth order related to your choice of major? A Statistics professor at a large university polled his students to find out what their majors were and what position they held in the family birth order. The results are summarized in the table.

a) What percent of these students are oldest or only children?

b) What percent of Humanities majors are oldest children?

c) What percent of oldest children are Humanities students?

d) What percent of the students are oldest children majoring in the Humanities?

Major                        1        2        3       4+       Total

Math/Science            34      14        6       3          57

Agriculture                52      27        5       9          93

Humanities                15      17        8       3          43

Other                       12      11        1       6          30

Total                      113      69       20      21       223

*1 = oldest or only child