As part of the marketing group at a film studio you are aske

As part of the marketing group at a film studio, you are asked to find out the age distribution of the audience of the studio\'s latest family friendly film as well as if the viewers had seen the movie before. With the help of 10 of your colleagues, you conduct exit interviews by randomly selecting people to question at 20 different movie theatres. The results are in the table below. Complete parts a and b below. Find the marginal distribution of the audience\'s previous viewing of the movie. Find each frequency of the marginal distribution.

Solution

(b)

Marginal ditribution age under 6:

44+0+1=45

under 6 to 9 :

59+23+1=83

under 10 to 14 :

79+41+37=157

under 15 to 21 :

12+1+0=13

Over 21 :

154+16+1=171