\[\boxed{\mathbf{235.}}\]
\[\textbf{а)}\ C_{4}^{2} \cdot {0,5}^{2} \cdot (1 - 0,5)^{2} =\]
\[= \frac{4!}{2!2!} \cdot {0,5}^{4} = \frac{3 \cdot 4 \cdot 0,0625}{2} =\]
\[= 0,375.\]
\[\textbf{б)}\ C_{4}^{1} \cdot {0,5}^{1} \cdot {0,5}^{3} = \frac{4!}{3!} \cdot {0,5}^{4} =\]
\[= 4 \cdot 0,0625 = 0,25.\]
\[\textbf{в)}\ C_{4}^{3} \cdot {0,5}^{4} = 0,25.\]
\[\textbf{г)}\ C_{4}^{0} \cdot {0,5}^{4} = {0,5}^{4} = 0,0625.\]