$1.$A closed level loop of differential levels was run to establish the elevations of several bench marks with the following results. Determine the most probable elevations. Show all of your work to receive credit.Distance $($ft$)$Observed elevations $($ft$)$Most Prob Elev.A to B$6500$BMA$1042\mathrm{.}69$B to C$3500$BMB$1036\mathrm{.}951036\mathrm{.}261$C to D$2500$BMC$1042\mathrm{.}781042\mathrm{.}409$D to E$3000$BMD$1048\mathrm{.}221047\mathrm{.}955$E to A$4500$BME$1041\mathrm{.}571041\mathrm{.}252$BMA$1043\mathrm{.}691042\mathrm{.}69$