$6.$ Based on the data provided in Table $2\mathrm{.}6,$ what is the flow rate of customers from $9$:$00$ a$.$m$.$ to $10$:$00$ a$.$m$.?$ TABLE $2\mathrm{.}6$ Time Stamps of $10$ Customers Who Visited a Local Bank Branch from $9$:$00$ a$.$m$.$ to $10$:$00$ a$.$m$.$

$\backslash$table$[[$Customer$,$Time in$,$Time Out$],[1,9$:$01,9$:$07],[2,9\mathrm{.}06,9$:$21],[3,9$:$08,9$:$20],[4,9$:$14,9$:$19],[5,9$:$20,9$:$28],[6,9$:$26,9$:$33],[7,9$:$31,9$:$39],[8,9$:$40,9\mathrm{.}46],[9,9$:$44,9$:$59],[10,9$:$53,9$:$57]]$