In addition to their age levels, the movie audiences in Exercise 2 were also asked if they had seen the movie be-fore (Never, Once, More than Once). Here is a table showing the responses by age group:

a) Find the marginal distribution of their previous viewing of the movie.
b) Verify that the marginal distribution of the ages is the same as that given in Exercise 2.

Transcribed Image Text:

Under 6 6 10-14 15-21 Over 21 84 38 32 Never Once More Than 151 15 39 60 20 16 Once