Understanding my engagement program
I'm trying to understand my nurture program and where it currently stands. Here is screenshot:

If I have 103 leads currently exhausted in stream 1, does that mean they received email 1 in stream 1? Also, within stream 1, I have them moving to stream 2 and then receiving email 2. Does that sound like the right process of things?
Also, I read the engagement score of 50 is average. But, what does this exactly mean? Any insight would be greatly appreciated!