$3\mathrm{.}36.$ Shown below are the top $10$ contractors of the U$.$S$.$ federal government by dollars according to the U$.$S$.$ General Services Administration. Use this population data to compute a mean and a standard deviation for these data.

$\backslash$table$[[\backslash$table$[[$Company$],[$Lockheed Martin$]],\backslash$table$[[$Amount of Contracts$],[($$ billions$)]]],[$Boeing$,50\mathrm{.}7],[$General Dynamics,$23\mathrm{.}4],[$Raytheon$,15\mathrm{.}3],[$Northrop Grumman,$14\mathrm{.}7],[$McKesson$,11\mathrm{.}2],[$Huntington Ingalls,$8\mathrm{.}8],[$Bechtel$,7\mathrm{.}2],[$BAE Systems,$5\mathrm{.}5],[$L$3$ Technologies,$5\mathrm{.}3]]$