Children have just returned to in-person classes at the local elementary school in Remote County after a year of remote learning. In the week before Easter, 5th grade children usually take a test of their readiness to enter Math instruction in Middle School the following year. The same test is given every year. The principal of the elementary school is trying to be hopeful, but she is concerned that performance this year will be lower than in previous years due to remote learning. She hires you to set up the data analysis needed to test her hypothesis that the scores will be lower than the average test score of the past 10 years, which has been 85. Remote County has Math test scores from 30 of their fifth graders (just before Easter). To test the principal's hypothesis that their scores are lower than the average of 85 from prior years, you decide to use a one sample t test, = .05 in one-tail. What is the critical t for this test