Pembahasan Ujian PAI: A70 – No. 1 – April 2019

• \(\Pr \left( {X = 0} \right) = \Pr \left( {X = 1} \right) = 0,25\)
• \(\Pr \left( {X = 2} \right) = 0,1875\)

Dan
\(\frac{{{p_2}}}{{{p_1}}} = a + \frac{b}{2}\) \(a + \frac{b}{2} = \frac{{0.1875}}{{0.25}} = 0.75\)

Dengan substitusi diperoleh
\(b + \frac{b}{2} = 0.75\) \(b = \frac{{0.75}}{{1.5}} = 0.5\)