Age 1517 1824 2534 35 or older Probability 0007 0573 0260 01

Age

15-17

18-24

25-34

35 or older

Probability

0.007

0.573

0.260

0.160

Reference: Ref 10-3

	According to the Current Population Survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups: Age 15-17 18-24 25-34 35 or older Probability 0.007 0.573 0.260 0.160 Reference: Ref 10-3 6. If we randomly select a full-time student, what is the probability that he/she is 25 or older?
	A. 0.260 B. 0.420 C. 0.740 D. Impossible to determine from the information given.

According to the Current Population Survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups: Age 15-17 18-24 25-34 35 or older Probability 0.007 0.573 0.260 0.160 Reference: Ref 10-3 6. If we randomly select a full-time student, what is the probability that he/she is 25 or older? A. 0.260 B. 0.420 C. 0.740 D. Impossible to determine from the information given. 7. Suppose we roll two fair four-sided dice. Let X denote the sum of the two roll outcomes. For example, if the first roll yields s??3 a? and the second roll yields a??1, a?? then X = 3 + 1 = 4. The probability distribution for X is given: Value of X 2 3 4 5 6 7 8 Probability 1/16 2/16 3/16 4/16 3/16 2/16 1/16 Reference: Ref 10-6 P(X

Solution

1.A.   0.260

2,C.   6/16

3.A.   5/36.