A bank manager wants to investigate the wait time for customers at an ATM machine within a centrally located mall, especially between $5\mathrm{.}00$ and $6\mathrm{.}00$ pm during weekends. Data collected from a sample of $15$ customers during this hour:

$4\mathrm{.}524\mathrm{.}685\mathrm{.}234\mathrm{.}153\mathrm{.}454\mathrm{.}005\mathrm{.}315\mathrm{.}35$

$3\mathrm{.}565\mathrm{.}204\mathrm{.}035\mathrm{.}103\mathrm{.}403\mathrm{.}204\mathrm{.}01$

a$.$ Calculate the mean and median.

b$.$ Calculate the variance, standard deviation and range.

Answer rating: 100% (QA)

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