You are taking classes to become a Master Gardener at the local County Extension office. You look around during your first class and realize that most of your classmates seem to be older adults. In fact, it seems that 50% of the class of 100 students are over 60 years old, with the remaining ages of participants spread evenly between 20-40 year-olds, and 40-60 year-olds. You decide to test your claim using publicly available registration records and a 0.05 significance level. What is the value of your test statistic?