<PRE><B>Question 1074133</B>
The summation from i = 1 to 4 of P(x) must = 1, therefore
:
a) K = 1 - (0.2 + 0.1 + 0.4) = 0.3
:
b)mean = (0 + 1 + 2 + 3) / 4 = 1.5
:
Variance = ( (0 - 1.5)^2 + (1 - 1.5)^2 + (2 - 1.5)^2 + (3 - 1.5)^2 ) / 4 = 1.25
:

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