Note that in the very next slide, the value 1.41667 is actually there, as the next tried value. (defun average (x y) (/ (+ x y) 2)) (defun itera

Note that in the very next slide, the value 1.41667 is actually there, as the next tried value. (defun average (x y) (/ (+ x y) 2)) (defun iterate (start) (loop repeat 3 for val = start then (average val (/ 2 val)) collect (list val (float val)))) (iterate 4/3) ((4/3 1.3333334) (17/12 1.4166666) (577/408 1.4142157)) (iterate 3/2) ((3/2 1.5) (17/12 1.4166666) (577/408 1.4142157)) Not sure if this is really a software bug, maybe a slide preparation bug.