Question

The value of a and b so that the following is probability mass function X:                            0              1              2 P(X =x):                                3a           3b           4b with mean 1.1, is:

A (0.1, 0.1)
B (0.2, 0.1)
C (0.2, 0.2)
D (0.1, 0.2)
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