This is an update regarding Assignment 16, problem 2c. This problem asks some variation of the question “what percentage… fall within 1 (or 2, or 3) standard deviations of the mean?” We learned the 68-95-99.7 rule, which is fine in general, BUT webwork is picky and wants more decimal points of accuracy than this rule provides. So here are the correct answers, to two decimal places:
“within 1 standard deviation of the mean”: ANSWER 68.27%
“within 2 standard deviations of the mean”: ANSWER 95.45%
“within 3 standard deviations of the mean”: ANSWER 99.73%
Thank you that worked.