a retailing entrepreneur sells sophisticated running shoes whose weights are normally distributed with mean of 12 grams and a standard deviation of 0,5 grams.
(a) what is the probability that a shoe weighs more than 13 grams
(b) what must be the standard deviation of weight be in order for the company to state that 99,9% of its shoes are less than 13 grams
(c) if the standard deviation remains at 0,5 grams, what must be the mean weight in order for the company to state that 99,9% of its shoes are less that 13 grams.
1 answer
http://davidmlane.com/hyperstat/z_table.html