7. A large distributor of gasoline claims that 60% of all cars that stop at their service stations choose regular unleaded gas. Premium and supreme are each selected 20% of the time. To investigate this claim, researchers collected data from a random sample of drivers who put gas in their vehicles at the distributor's service stations in a large city. Here are the results. Carry out a test of the distributor's claim at the 5% significance level.

Regular 261

Supreme 88

Premium 51

(this was in a table, and please use the four-step process on lined paper)