Find X1, X2, X3, and X4.

Treasury bill bid and ask data are representative over-the-counter quotations as of 3pm Eastern time quoted as a discount to face value. Treasury bill yields are to maturity and based on the asked quote. Asked 0.065 Asked yield 0.066 Bid 0.075 0.078 0.078 0.078 0.080 0.080 0.085 0.085 0.085 0.083 0.088 0.068 0.068 0.068 0.070 0.070 0.075 0.075 0.075 0.073 Maturity 11/5/2020 11/10/2020 11/12/2020 11/17/2020 11/19/2020 11/24/2020 11/27/2020 12/1/2020 12/3/2020 12/8/2020 12/10/2020 12/15/2020 12/17/2020 12/22/2020 12/24/2020 12/29/2020 12/31/2020 1/7/2021 1/14/2021 1/21/2021 1/28/2021 X4 0.068 0.068 0.068 0.071 0.071 0.076 0.076 0.076 0.074 X1 Chg unch. unch. +0.003 +0.005 +0.010 +0.003 +0.010 unch. +0.005 +0.003 +0.005 +0.005 unch. unch. +0.007 +0.005 +0.007 +0.007 +0.005 -0.013 +0.003 +0.005 0.078 0.075 0.075 X2 0.085 0.085 0.080 0.090 0.090 0.093 X3 0.080 0.080 0.083 0.076 0.076 0.071 0.081 0.081 0.084 0.079 0.079 0.066 0.081 0.084 0.088 0.075 0.090 0.093 0.095 0.095 0.078 0.078 0.065 0.080 0.083 0.086 2/11/2021 2/18/2021 0.085 0.085 +0.005 +0.005 0.086