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Four values 1 to 4 have chances 0.1, k, 0.3 and 0.4 respectively. What is k?
A0.2
B0.3
C0.4
D0.1
Answer & Solution
Correct answer: A. 0.2
All probabilities must add to 1, so k = 1 - 0.8 = 0.2.
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