How do you determine 39?

For questions 37-39, refer to the following: Quadri et al. (2020) conducted a study to examine the basic knowledge on COVID-19 among different types of dental health care workers in Saudi Arabia. The observed frequencies for one of the questions are provided below. Using a 0.05 significance level, you need to test the claim that there is a significant association between type of dental health care worker and response to the question "What is COVID-19?" Dental Health Care Worker Intern Auxiliary Specialist Immunity Disorder 49 39 20 What is SARS Infection 8 26 19 COVID-19? Acquired Zoonotic 36 76 54 Pulmonary Disease 69 61 43 37. What is the expected frequency of specialists who answered pulmonary disease? a. 0.35 b. 29.71 C. 43.00 d. 47.06 e. Cannot be determined with the given information 38. How much does the cell for interns who answered SARS infection contribute to the overall test statistic? a. 29.71 b. 17.17 C. 8.00 d. 4.90 e. Cannot be determined with the given information 12 PubH 6002: Biostatistical Applications for Public Health 39. What is the distribution of the appropriate test statistic? a. t with 11 degrees of freedom b. x2 with 1 degree of freedom c. x2 with 6 degrees of freedom d. x2 with 12 degrees of freedom . F with 3 numerator and 2 denominator degrees of freedom