Match the variations to the category of causes "common" vs$.$ "assignable"

A thousand LED light bulbs from the same batch last for different length of time before each burns out.

Each of a thousand LED light bulbs from the same batch emits almost negligibly different amount of light $($called luminosity$).$

$17$ of $1000$ LED light bulbs burn out significantly earlier than the guaranteed $20$ years of age because these $17$ bulbs were installed in poorly ventilated areas which cause the circuit board in the bulb to overheat

The logo on half of $1000$ LED light bulbs from the same batch was printed wrong because an operator chose the wrong pattern.