The mean \( \mu \) is given by:
\[ \mu = \sum (x \cdot P(X = x)) \]
Given values:
\[ x = -39, -20, -9, -6 \]
\[ P(X = x) = 0.56, 0.22, 0.16, 0.06 \]
Calculate each term:
\[ -39 \cdot 0.56 = -21.84 \]
\[ -20 \cdot 0.22 = -4.40 \]
\[ -9 \cdot 0.16 = -1.44 \]
\[ -6
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