a) "P(X) = \\frac{f_i}{N}"
N = 25+125+75+175+75+25=500
b) E(X) = Σ(XP(X))
"= 0 \\times 0.05 + 15 \\times 0.25 + 30 \\times 0.15 + 45 \\times 0.35 + 60 \\times 0.15 + 75 \\times 0.05 \\\\\n\n= 36.75"
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