Your elderly grandfather prefers to ride the city bus, and many of his friends do as well.However, you also notice that many elderly people use rideshare apps like Lyft and Uber.You want to know whether elderly people are more likely to use the bus, or rideshare apps for transportation, but you notice that there's no published data suggesting an answer.You create a a one-way chi square analysis and recruit 120 participants for your sample.What is the expected frequency for the number of elderly people in your sample who prefer the bus?