Going crazy trying to figure out textbook answer - see snapshot Data set is (1,2,3,1,5,6,2,4,1,2,4,2,9) looking for mean of sample data/ variance and sample deviation. I hand computed and received close answers; to find sample variance I took the data set and subtracted sample mean then squared and then divided n-1 coming up with Sample variance similar: 5.476361 rounded to 5.5 . where did they get 202 to subtract - see image

Data set above: Trying to figure out book answer; to find sample variance I took the data set and subtracted sample mean then squared and then divided n-1 coming up with Sample variance similar: 5.476361 rounded to 5.5 The sample mean is: y = Zy 1+2+3+1+5+6+2+4+1+2+4+2+9 42 = 3.231 n 13 13 Text book answer is: The sample variance is: (Ev) 422 202 = n 13 = 5.526 n-1 13-1 Where did they get 202