Question

What's the answer to #3-6?

Answer 1

All you need to do here is add all the answers up and divide them by the number of how much answers there where.
Example: #3: 2.5+4.6+6.7+4.8=18.6 .  
18.6/4=4.65
hope I helped

Answer 2

U simply add all  the six numbers and divide by it . when you add all the test scores you get 407.6 . Next you divide that by 6 since there were 6 tests taken and the test avg is 81.46 which falls under b category for grades provided from
 the table