78 . Hope this was helpful
Answer:
C) 
Step-by-step explanation:

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.
Answer: 28:9
Step-by-step explanation:
56:18
56÷2=28
18÷2=9
=28:9
0.88. you can simply see this by using the right use of the data