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 help of 10 of your colleagues, you conduct exit interviews by randomly selecting people to question at 20 different movie theatres. From 485485 responses, you find out that 4646 are younger than 6, 8484 are 6 to 9 years old, 161161 are 10 to 14, 2121 are 15 to 21, and 173173 are older than 21. Complete parts a and b below.