Select to a first-year college student at random and ask what.his or her academi

Question

Select to a first-year college student at random and ask what.his or her academic rank was in high school. Here are the probabilities, based on proportions a large sample survey of first-year student: What is the sum of these probabilities? Why do you expect them sum to have this value? What is the probability that a randomly chosen first-year college student was not in the top 20% of his or her high school class? What is the probability that a first-year student was in the top 40% in high school?

Explanation / Answer

a). sum of the probabbility= 0.41+0.23+0.29+0.06+0.01 = 1

Expect this value to be 1, because this is a probabilty distribution.

b). P=0.41

c). P=0.41+0.23 = 0.64

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