The following are the grades of students who wrote all the exams in Statistics 2500 over a three year period but failed the course. Grades of Students Failing 20 21 22 22 23 23 32 32 33 33 34 39 40 43 43 43 Find the "Variance " of the failing grades, assume the numbers are a sample of grades. 12 Give your answer to round to nearest two decimal places. Your Answer: 15 Answer 18 Question 20 (1 point) I tell you that the mean of a set of numbers is 25 and that I am adding one more number k = 133 to the set of numbers. The number added is larger than any number in the old set. The old set contained 10 numbers. Calculate the mean of the new set of 11 numbers, give your answer to round to nearest two decimal places. Your