Question: In addition to their age levels the movie audiences in

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.

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