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. with the of 10 of your colleagues, you conduct exit interviews by randomly selecting people to question at 20 different movie theatres. from 474 responses, you find out that 51 are younger than 6, 87 are 6 to 9 years old, 149 are 10 to 14, 16 are 15 to 21, and 171 are older than 21. complete parts a and b below.