Step 1	\({\bar A_x} = \frac{\mu }{{\mu + \delta }}\) \(0,3443 = \frac{\mu }{{\mu + 0,08}}\) \(\mu = \,0,0420070154\)
Step 2	\({}^2{\bar A_x} = \,\frac{\mu }{{\mu + 2\delta }}\) \({}^2{\bar A_x} = 0,2079482998\)
Step 3	\(Var[{\bar Z_x}] = {}^2{\bar A_x} – {\bar A_x}{}^2\) \(Var[{\bar Z_x}] = 0,2079482998 – 0,3443{}^2\) \(Var[{\bar Z_x}] = 0,08940580981\)
Step 4	\(Var[{\bar a_{\left. {\overline {\, {{T_x}} \,}}\! \right\| }}] = \frac{{Var[{{\bar Z}_x}]}}{{{{(\delta )}^2}}}\) \(Var[{\bar a_{\left. {\overline {\, {{T_x}} \,}}\! \right\| }}] = \frac{{0,08940580981}}{{{{\left[ {0,08} \right]}^2}}}\) \(Var[{\bar a_{\left. {\overline {\, {{T_x}} \,}}\! \right\| }}] = 13,96965778\) \(Var[{\bar a_{\left. {\overline {\, {{T_x}} \,}}\! \right\| }}]\, \simeq \,14\)
Jawaban	b. 14