A market researcher working for a bank wants to know if the distribution of applications by card is the same for the past three mailings. She takes a random sample of 200 from each mailing and counts the number applying for Silver, Gold and Platinum. The data follow:

Type of Card Silver Gold Platinum Total Mailing 1 120 50 30 200 Mailing 2 115 50 35 200 Mailing 3 105 55 40 200 Total 340 155 105 600