Calculate the answer of the following question
Question- The scores on a placement test given to college freshmen for the past five years are approximately normally distributed with a mean of 74 and a variance of 8.
Part 1- If a random sample of 20 students who take the placement test this year had a sample variance of 20, calculate the critical chi statistic. Round answer to 3 decimal places.
I need experts help to find the critical chi statistic.