Step-by-step explanation:
Add all the books then find the average
Answer:
The Mean is 6.142
The mean is the total of the numbers divided by how many numbers there are.
22.5 batches
117
6/8 = ?/156
156/8 = 19.5
19.5 x 6 = 117
6/8 = 117/156
AAS
I believe