A matrix chart with six opportunities indicates the following information for $100$ production units.

Defects$/$unit

$0$

$1$

$2$

$3$

$4$

$5$

Number of Units

$60$

$20$

$5$

$4$

$10$

$1$

Determine the average DPU.

$0\mathrm{.}62$

$0\mathrm{.}65$

$0\mathrm{.}46$

$0\mathrm{.}68$