One of the larger species of tarantulas is the Grammostola mollicoma, whose common name is the Brazilian giant tawny red. A tarantula has two body parts. The anterior part of the body is covered above by a shell, or carapace. F. Costa and F. Perez-Miles discussed the carapace length of the adult male G. mollicoma in the article "Reproductive Biology of Uruguayan Theraphosids" (The Journal of Arachnology, Vol. 30, No. 3, pp. 571-587). The carapace lengths of a random sample of 50 adult male G. mollicoma have a mean of 18.14 mm and a standard deviation of 1.76 mm.

The quantitative data set under consideration has roughly a bell-shaped distribution. For each exercise,

a. Construct a graph similar to Fig. 3.8 on page 118.

b. Apply Property 1 of the empirical rule to make pertinent statements about the observations in the sample.

c. Repeat part (b) for Property 2 of the empirical rule.

d. Repeat part (b) for Property 3 of the empirical rule.