Exercise $4-7($Algo$)($LO$4-2)$

The Thomas Supply Company Incorporated is a distributor of gas$-$powered generators. As with any business, the length of time customers take to pay their invoices is important. Listed below, arranged from smallest to largest, is the time, in days, for a sample of the Thomas Supply Company Incorporated invoices.

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$($Round your answers to $2$ decimal places.$)$

a$.$ Determine the first and third quartiles.

Answer is complete but not entirely correct.

$\backslash$table$[[$First quartile,$30\mathrm{.}75x$