Solution:
Discrete probability distribution can be written as follows
X. Number P(X)
1 . 506 (506/2000) = 0.253
2 390 (390/2000) = 0.195
3 310 (310/2000) = 0.155
4 218 (218/2000) = 0.109
5 576 (576/2000) = 0.288
Solution(b)
For valid discrete probability distribution total probability should be 1
P= 0.253+0.195+0.155+0.109+0.288 = 1
So it is a discrete probability distribution.
Solution(c)
Probability for more than 3 years = p(X=4) + P(X=5) = 0.109+0.288 = 0.397 or 39.7%
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