Concept:To divide a number in bar notation by 5, adjust the characteristic so it becomes a multiple of 5, then divide separately.Explanation:Given 13.15836 means −13+0.15836.We need to divide this by 5.Rewrite −13 as −15+2 (since −15 is divisible by 5).So 13.15836=−15+(2+0.15836)=−15+2.15836.Now divide each part by 5: −15/5=−3, and 2.15836/5=0.431672.Thus the result is −3+0.431672=3.43167 (rounding mantissa to five decimals).Answer:Option C: 3.43167