I need help figuring out the last two answers. YTM and bid ask spread.

Asked Yield Maturity 8/31/2017 5/15/2018 2/28/2019 2/29/2020 8/15/2021 1/15/2022 8/15/2023 2/15/2024 2/15/2026 8/15/2026 2/15/2027 8/15/2027 8/15/2028 1/15/2028 2/15/2029 8/15/2029 5/15/2030 2/15/2031 2/15/2036 2/15/2037 2/15/2038 Chg 0.1563 -0.3125 0.3516 -0.3750 -0.5234 -0.4063 0.4453 -0.4844 -0.6875 -0.7266 0.7422 0.7422 0.7422 -0.7031 -0.7031 -0.7500 -0.7813 -0.7266 0.7266 -0.7422 -0.7031 Coupon Bid 102.8828 10.3125 98.6953 95.7734 140.1328 92.1563 98.0703 99.6094 130.2813 138.7500 37.9219 135.6875 126.2891 123.3828 123.3594 34.5156 136.8359 125.8984 114.7578 18.7813 112.6016 Asked 102.9141 110.3750 3.875 1.375 1.250 8.125 1.317 95.8203 140.1797 92.2031 98.1328 99.6719 130.3594 138.8281 138.0000 135.7656 126.3672 123.4609 123.4375 34.5938 136.9141 125.9766 114.8359 118.8594 1.996 2.231 2.635 2.726 2.788 2.962 2.989 3.048 3.100 2.500 2.750 6.000 6.750 6.375 5.250 5.250 6.125 6.250 5.375 4.500 4.750 4.375 3.230 3.256 3.256 3.289 3.352 3.523 3.542 3.582