Given that there are three spotted Pacific banana slugs for every four non spotted Pacific banana slug(s) in Arcata's community forest, let xx represent the probability of drawing a single spotted Pacific banana slug from a single draw of both varieties of spotted and non spotted slugs.

The probability of selecting a single spotted Pacific banana slug will be .

Step-by-step explanation:

There are three spotted Pacific banana slugs for every four non spotted Pacific banana slugs.

There are three  spotted Pacific banana slugs in every group of 7 Pacific banana slugs.

There are four non spotted Pacific banana slugs in every group of 7 Pacific banana slugs.

Therefore the probability of selecting a single spotted Pacific banana slug will be

= .

The probability of selecting a single non spotted Pacific banana slug will be = .