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P(X = x) = kx for x = 1, 2, 3, 4 is a p.m.f. Find k.
A1/10
B1/6
C1/4
D1/8
Answer & Solution
Correct answer: A. 1/10
k(1+2+3+4) = 10k must equal 1, so k = 1/10.
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