Answer:
(a) Hypergeometric distribution
(b) 0.785384...
Step-by-step explanation:
(a) looking at the question, we see that
, suppose Evans studied s key terms, this implies that he has not studied 100 - s key terms. Suppose
if X = k, then k out of the s key terms he had studied appeared. But 10 - k out of 100 - s key terms he hasn't studied appeared. Thus X is an Hypergeometric distribution, X~HGeom(s, 100 - s, 10) with PMF:

Over up x-axis goes over y-axes up
Plug in -3 for x.
f(-3) = 0.5(3 - (-3))
f(-3) = .5(6)
f(-3) = 3
Answer:
oooh, tough one...
Step-by-step explanation:
but, all in all, your life doesn't depend on it! Take a break and have a nice day!