Question: Birth order. A survey of students in a large Introductory Statistics class asked about their birth order (1 = oldest or only child) and which college of the university they were enrolled in. Here are the data:

Birth Order

1 or only 2 or more Total

Arts & Sciences 34 23 57

Agriculture 52 41 93

Human Ecology 15 28 43

Other 12 18 30

Total 113 110 223

Suppose we select a student at random from this class.

a) What is the probability we select a Human Ecology student?

b) What is the probability that we select a firstborn student?

c) What is the probability that the person is firstborn and a Human Ecology student?

d) What is the probability that the person is firstborn or a Human Ecology student?