[tex]\begin{gathered} Z-\text{score = }\frac{X-X^i}{\partial} \\ \text{Where X}^i=\operatorname{mean}\text{ and }\partial=\text{ standard deviation} \\ \text{From the information provided, } \\ X=68,X^i=64,\text{ }\partial=4 \\ Z-\text{score = }\frac{68-64}{4}\text{ = }\frac{4}{4}\text{ = 1} \end{gathered}[/tex]
From the result, the correct answer is option A, that is the first option
