Problem 140E

Raw materials are studied for contamination. Suppose that the number of particles of contamination per pound of material is a Poisson random variable with a mean of 0.01 particle per pound.

(a) What is the expected number of pounds of material required to obtain 15 particles of contamination?

(b) What is the standard deviation of the pounds of materials required to obtain 15 particles of contamination?

Dy 32 10252016 Lecture 17: The First Human Diaspora: Homo erectus/ergaster Australopithecine Terminology ● Australopithecine group ○ Australopithecus afarensis ○ Paranthropus and Australopithecus boisei Australopithecine to Early Homo ● Brain increase in brain size ● Face reduction in size ● Teeth reduction in size ● After Australopithecus afarensis, more modernlooking and variable ○ Earliest Homo are found in robust forms in East Africa Genus Homo ● Larger, rounded brain casing ● Less projecting face ● Smaller teeth ● More efficient bipedalism (habitual