This would be your equation;
[tex] \frac{ \sqrt{164} }{2} [/tex]
So first find the value of the square root;
[tex] \sqrt{164} = 12.81 [/tex] (rounded to the nearest hundredth)
Next divide the decimal by 2;
12.81 ÷ 2 = 6.41(rounded to the nearest hundredth)
So your final answer would be; 6.41
Hope this helps! :D