1.5.(10%) The following table shows part of the probability distribution for a random Variable \( x \). The mean of the distribution is known to be 1.8 (\( E(x) = 1.8 \)). Determine \( f(1) \) and \( f(3) \).
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1.5.(10%) The following table shows part of the probability distribution for a random Variable \( x \). The mean of the distribution is known to be 1.8 (\( E(x) = 1.8 \)). Determine \( f(1) \) and \( f(3) \).