Item$9$

$10$

points

eBookPrintReferencesCheck my workCheck My Work button is now enabledItem $9$

Problem $10-20($Static$)$

A teller at a drive$-$up window at a bank had the following service times $($in minutes$)$ for $20$ randomly selected customers:

SAMPLE

$1234$

$4\mathrm{.}54\mathrm{.}64\mathrm{.}54\mathrm{.}7$

$4\mathrm{.}24\mathrm{.}54\mathrm{.}64\mathrm{.}6$

$4\mathrm{.}24\mathrm{.}44\mathrm{.}44\mathrm{.}8$

$4\mathrm{.}34\mathrm{.}74\mathrm{.}44\mathrm{.}5$

$4\mathrm{.}34\mathrm{.}34\mathrm{.}64\mathrm{.}9$

Click here for the Excel Data File

a$.$ Determine the mean of each sample. $($Round your answers to $1$ decimal place.$)$