Maka	\({\mu _x} = \frac{{ – \frac{d}{{dt}}S(x)}}{{S(x)}}\) \({\mu _x} = \frac{{ – \frac{d}{{dt}}{{\left( {1 – \frac{x}{{60}}} \right)}^{\frac{1}{3}}}}}{{{{\left( {1 – \frac{x}{{60}}} \right)}^{\frac{1}{3}}}}}\) \({\mu _x} = \frac{{ – \frac{1}{3}\left( { – \frac{1}{{60}}} \right){{\left( {1 – \frac{x}{{60}}} \right)}^{ – \frac{2}{3}}}}}{{{{\left( {1 – \frac{x}{{60}}} \right)}^{\frac{1}{3}}}}}\)
	\({\mu _{35}} = \frac{{ – \frac{1}{3}\left( { – \frac{1}{{60}}} \right){{\left( {1 – \frac{{35}}{{60}}} \right)}^{ – \frac{2}{3}}}}}{{{{\left( {1 – \frac{{35}}{{60}}} \right)}^{\frac{1}{3}}}}}\) \({\mu _{35}} = \frac{1}{{75}}\) \({\mu _{35}} \cong 0,0133\)
Jawaban	c. 0,0133