A recent estimate by a large distributor of gasoline claims that 60% of all cars stopping at their service stations chose unleaded gas and that super unleaded and regular were each selected 20% of the time. In order to check the validity of these proportions, a study was conducted of cars stopping at the distributor's service stations in a large city. The results were as follows: Gasoline Selected
Regular Unleaded Super Unleaded
51 261 88
Carry out a significance test of the distributors claim