An employee is exposed to several different sound levels.

Sound levels and exposure time are:

$90$ dBA for $5$ hours

$100$ dBA for $30$ minutes

$110$ dBA for $15$min

Identify the following:

Equivalent noise exposure factor $($calculate value$-$carry answer to two decimals$)$

Is hearing protection needed? $($yes or no$)$

Blank # $1$

A

Blank # $2$

A