Question: The weights of laboratory cockroaches follow a Normal distribution with mean 80 grams and standard deviation 2 grams. The following figure is the Normal curve for this distribution of weights.
About what percent of the cockroaches have weights between 76 and 84 grams?
(a) 99.7%
(b) 95%
(c) 68%
(d) 47.5%
(e) 34%